RP is nice, but not much of a reason to purchase the system. I do play my Vita much more than my PS3 now, so I'll likely use the remote play feature a lot providing the controls are mapped well. But as I said, it is not an essential feature.
Vita needs games ... lots of them and different types of them too.
Playstation = The Beast from the East
Sony + Nintendo = WIN! PS3 + PSV + PS4 + Wii U + 3DS