While it will give it a bump, it won't give the system a long term sales boost.
The problems the Vita has are:
1.) Sony has no notable first party franchises in Japan with which to support a system and build a customer base.
2.) Most of Sony's strongest partners are either keeling over and dying in the retail business (Square Enix, Konami, Level 5), or have seemingly left their handheld (Capcom). This leaves them with some Sega and Nacmo support, both of whom have relatively smaller franchises.
3.) The Vita's potential fanbase is currently split between the 3DS, PS3, and mobile phones, and all these platforms are in a relatively or very healthy state right now, so there's not much interest in moving off of them.
4.) Due to the above, the system seems to have a vote of no confidence from third parties, which prevents the most important thing: a constant stream of games consumers are interested in buying in the 200K+ range, at least every 2-5 weeks (depending on time of year), and at least 2-3 500K+ big sellers per year.
Now, there are some series starting to put up bad to mediocre numbers on the 3DS (Revelations, KH3D) and PSP (Yakuza), but there's no clear sign that the Vita is the solution to that problem for them, so they might just stop investment, move to another platform that isn't the Vita, or stick with what they're doing.
