Why would I buy a WiiU for GTAV when my PS3 or 360 can play it?
No. GTA V (among others) would convince you to buy a Wii U for it would prove Nintendo will get full third party support this time. Makes more sense that way, huh?
OT: Why not? The only thing that could stop Rockstar from making a port for the Wii U would be a general lack of trust in Nintendo platforms. And this is just what Nintendo wants to tackle with the Wii U. GTA V, Assassin's Creed 3, Resident Evil 6, Call of Duty... all of those can be easily ported to the Wii U. If Nintendo can get them all they'll get the "core" gamers, too. It's like Pokemon but with gaming franchises