i think that:
skaven will rule them all. simply the best "natural" reproduction rate around and, if i got it right, they are already beneath every single stone in the world via a vast underground tunnel system
...
which will rule out the dwarfs as a large civilization. though i think that small enclaves of even harder and sturdier stunties, completely isolated underground, will survive. probably a rise of chaos dwarfs will show up in some of these underground insulas.
VC will never die out. as long as things live, they will die in the end and bolster the ranks of the undead. unlike the tomb kings, they will prosper but never take over. (would they take over, there wouldn't be any living ones around anymore to die and so on)
tomb kings should only have a decreasing pool of recruits. they don't "recruit" new dead, do they? only "revive" their long dead comerads. so there should be an end for them in the long run. but because they are living in deserts mostly they will hold out for a long time against living races - especially skaven, as they field masses and need food and water in large numbers to overcome hot temps.
beastmen - i don't know. probably lose out against other big time players or even get killed by the brets and wood elves - who i think form an alliance (seems very probable reading the WE army book)
the imperium has two different ways to go. they could go the "nicer" route of france/britain and industrialize or become a prussian kinda state. in the first case they will prosper and might hold off attackers by advanced tech. they might even become a safehold for different races, who are getting extinct (elves, dwarfs come to my mind). in the latter case they will absolutely win the world. because i am sure, that a prussian state was the the origin of the 40k warhammer imperium/space marines. total militarisation, uniforming of mind and matter and later resulting in hate to everything alien-like.
dark elves - they got nothing, not even a proper economy, only plundering and pirating. no chance for them to survive high elves nor chaos especially if they can't pirate and plunder anymore. they, too, should have a reproduction problem.
high elves - lose out and get digested by more modern races like imperium or sth. like that. maybe ulthuan sinks (like atlantis?) and they have to turn to the empire or maybe go to lustria - there seem to be some connections to the oldest of the slann.
lizardmen seem quite ok to me. breeding pools spawn new servants again. if they keep the slanns intact, they should have good possibilities to keep the status quo. if slanns die out and skinks take over, they should modernize probably (as i think that the skinks seem quite smart) if the skinks can't take over the leadership whole lustria brain fries and the lizzies become enormous, instinctive predators. probably losing all traits of a civilized race but maybe starting anew.
chaos - i just don't care for them. but they will be an endless player in this world.
OK is going to fall apart but individuals will strive as mercs as they do already.
O&G seem to be too sturdy to be exterminated and too willingly to fight to the end. might become a big winner if the'd stabilized politically - whatever that might mean for orcs, probably ruled by a goblin blessed by gork and mork together... nah.... that would be too un-orky. when the orcs win it all, they will extinct themselves... yep, i am sure, that the last thing on earth is going to be an orc who decapitates the next to last orc. he will be the greatest orc ever - no doubt 'bout that.
skaven will rule them all. simply the best "natural" reproduction rate around and, if i got it right, they are already beneath every single stone in the world via a vast underground tunnel system
...
which will rule out the dwarfs as a large civilization. though i think that small enclaves of even harder and sturdier stunties, completely isolated underground, will survive. probably a rise of chaos dwarfs will show up in some of these underground insulas.
VC will never die out. as long as things live, they will die in the end and bolster the ranks of the undead. unlike the tomb kings, they will prosper but never take over. (would they take over, there wouldn't be any living ones around anymore to die and so on)
tomb kings should only have a decreasing pool of recruits. they don't "recruit" new dead, do they? only "revive" their long dead comerads. so there should be an end for them in the long run. but because they are living in deserts mostly they will hold out for a long time against living races - especially skaven, as they field masses and need food and water in large numbers to overcome hot temps.
beastmen - i don't know. probably lose out against other big time players or even get killed by the brets and wood elves - who i think form an alliance (seems very probable reading the WE army book)
the imperium has two different ways to go. they could go the "nicer" route of france/britain and industrialize or become a prussian kinda state. in the first case they will prosper and might hold off attackers by advanced tech. they might even become a safehold for different races, who are getting extinct (elves, dwarfs come to my mind). in the latter case they will absolutely win the world. because i am sure, that a prussian state was the the origin of the 40k warhammer imperium/space marines. total militarisation, uniforming of mind and matter and later resulting in hate to everything alien-like.
dark elves - they got nothing, not even a proper economy, only plundering and pirating. no chance for them to survive high elves nor chaos especially if they can't pirate and plunder anymore. they, too, should have a reproduction problem.
high elves - lose out and get digested by more modern races like imperium or sth. like that. maybe ulthuan sinks (like atlantis?) and they have to turn to the empire or maybe go to lustria - there seem to be some connections to the oldest of the slann.
lizardmen seem quite ok to me. breeding pools spawn new servants again. if they keep the slanns intact, they should have good possibilities to keep the status quo. if slanns die out and skinks take over, they should modernize probably (as i think that the skinks seem quite smart) if the skinks can't take over the leadership whole lustria brain fries and the lizzies become enormous, instinctive predators. probably losing all traits of a civilized race but maybe starting anew.
chaos - i just don't care for them. but they will be an endless player in this world.
OK is going to fall apart but individuals will strive as mercs as they do already.
O&G seem to be too sturdy to be exterminated and too willingly to fight to the end. might become a big winner if the'd stabilized politically - whatever that might mean for orcs, probably ruled by a goblin blessed by gork and mork together... nah.... that would be too un-orky. when the orcs win it all, they will extinct themselves... yep, i am sure, that the last thing on earth is going to be an orc who decapitates the next to last orc. he will be the greatest orc ever - no doubt 'bout that.