Same with me, and the same happened with Valkyria on PS3.
Wonder what's the game gonna be next time to have that kind of effect.
Valkyria Chronicles made my PS3 purchase worthwhile!
I had LittleBigPlanet and Motorstorm...loved the latter but got stuck on it, the former I didn't like all that much past the "wow I can create levels" before realising how much I suck at it.
Valkyria just defined the justification of paying £300 for my PS3.
Regarding the developers not developing on their hardware no more...I am sure they look forward to developing on different platforms now to see what they can do with it. Project Rub was a good concept early in the DS' life and they seemed to know how to make great Xbox exclusives. I am sure they would love to recreate their games on SEGA hardware, but I also believe that they can challenge themselves on the Vita, 3DS etc just as much since it's a new challenge for them!