The only thing that matter to a gaming device are the games, and so far I haven't seen any PS Vita game that catched my interest.

Same thing with the 3DS, I haven't seen any 3DS game to catch my interest either, which is why I don't have a 3DS. Well, I was interested in Mega Man Legends 3, but it's been cancelled

Anyway, because of the lack of interesting games my interest in Vita is pretty much zero and I sure won't buy one at launch. But if the Vita have a good game library 4 years from now then it's possible I will buy one.