The days of system sellers aren't over. FFXIII should be a system seller. That and GT5, and it's probable that Natal and Sony motion will have system selling software with them. Whether they're of the caliber of Wii Sports or not... I suppose it's possible.
A game I'm developing with some friends:
www.xnagg.com/zombieasteroids/publish.htm
It is largely a technical exercise but feedback is appreciated.