Don't think I'd rebuy it even with Motion controls
If you already own it I think a patch will be released for the motion controls, I don't think you will have to buy the game again, only the Move controllers.
I'll be picking up Move for sure, I can think of it suiting quite alot of games and might even give you some kind of edge in FPS's.
Either way, i'm liking what i'm seeing so far, sure there will be lots of support for it by developers.
Think of MetalGear Rising with Move, that would be INSANE!