This could be something fantastic IF developed right with a nice OS X interface.
If they can get NES, SNES, SMS, Genesis, and TurboGrafx games working perfectly, it would be a great start. Then follow up with GBA, N64, and PS1 and you will have the PERFECT all in one emu.
Do I think the devs can pull that off? No way.
Do I hope they do? With every fiber of my being.