No doubt. The support from SCE could've been much better.
SCE has never had enough of those smaller AA and A games (faster and less expensive to make) that are enjoyable on a handheld and instead of releasing some of their smaller games like Daxter, Patapon and LocoRoco they went with too expensive titles like Uncharted: Golden Abyss and Killzone: Mercenary that would've fitted far better as home console games anyway.
Though no matter what the Vita would've probably never achieved the same sucess as the PSP but they could've bought a studio like Level-5 prior to Vita's launch. While not developing many AAA games Level-5 develops a bunch of great AA handheld games which is just what the Vita is missing.
Dark Cloud + Chronicle
Rogue Galaxy
Yo-Kai Watch
Danball Senki
Jeanne d'Arc
White Knight Chronicles
Ni no Kuni
Wonder Flick
Professor Layton
Inazuma Eleven
etc.
Additionally, SCE's Japanese developers could've supported the Vita better with games like Gran Turismo, Ape Escape, Puppeteer, Knack and aforementioned Patapon and LocoRoco.
