You have too much faith in developers appealing to something beyond the lowest common denominator. It wouldn't happen, not for controls.
Split userbases aren't a problem, not really. All that it does it take the fundamental problem of consumerism - you can only buy so much - and cordone off larger sections of choices.
I'm still not seeing advantages which outweigh the disadvantages, here. It's a recipe for stagnancy of interaction, of tech, and of design.







