This is my main problem with the Vita. Almost all of the appealing games are all games I can already/have already played on home consoles.
To me, unless you're a child who constantly is riding somewhere, or a commuter, a handheld should typically get very little mobile use. So it has to differentiate from home consoles for me, because as an adult with vehicles, I won't play it much outside my house. And no point in firing up this on the Vita when I own it on PS3.
So no, I don't think this really does anything for sales. I mean, you can buy BL2 for $20 now, or the GOTY version for $40.