I'm not so sure this would happen, although I would like it to happen, I've never understood why Apple doesn't make more affordable products.. If Apple would make more affordable Macs I think people would jump the bandwagon, the primary reason more people use a Windows machine is because it's much more affordable.
I don't think it'd too complicated making a more affordable computer while still making it look beautiful, cuz we all know Apple doesn't like to compromise design.. I just think if Apple did target that $300-600 market we would see so many more Mac users.. which would mean more people would also start developing for OSX
Apple doesnt make more affordable computers because they would make less money if they did so.