With minor modding the current game allows fort mode to be played with humans, goblins, elves and even kobolds. Presumably this hasn't made it into vanilla because they aren't as feature complete as dwarves and not yet differentiated enough. Is the work around the myth generator likely to change this? I assume some work will need to go into shoe-horning randomly generated high-magic-world races into fortress mode and am wondering if you think this will end up incorporating the original races as playable in vanilla at the same time or if they will wait for their own specific releases focused on the features you want present before making them playable?
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A completely mundane world has only humans, so unless those worlds would be playable only in adventure mode (which seems rather unlikely) humans will have to be fleshed out, and you have the same issue at the chaotic end of the spectrum. Thus, at least one race ought to be playable in fortress mode for every setting of parameters, and preferably all of the "civilized" ones should be. The completely mundane setting can be handled by hand crafting humans, but the chaotic end would need a high degree of procedural adaptation to the world/race properties, and if that issue is handled there, it ought to be possible to apply it throughout to all races. Even so, that might not rule out a situation where the functionality remains geared towards the current dwarves, with logical options being absent/not yet implemented for other races. The current modding option is to create different looking dwarves, possibly with some functionality removed, but little added (shaping trees into housing for elves, vitamin D deficiency for humans and elves when spending too much time away from the sun...).