Thinking about this more, I could hope for something that mirrors the C64/Amiga scene... I like the thought of open, unified architecture (like an A500, for example) bringing out creativity and community. That sort of thing won't make it rise above the big three, but it could still be incredibly awesome for demos, music, art, tools, and of course games. I know that's not the goal (seems like most folks just want to play what's already out there on a cheap system), but hell, I'd support it 100% if it went in that direction.
What you actually want is a Pandora, then:
http://www.openpandora.org/