I agree. But this is more related to the business-side of things rather than the consumer side of things. For me it doesn't really whether a game was a launch game or not (I didn't bought a PS Vita at launch for the record)
I agree, maybe the issue from a commercial point of view was that the PS Vita launch line-up was too good. Maybe they should have held back some games like Uncharted: Golden Abyss and release it later during a more quiet period, to keep giving an image of a system with momentum and regular new releases.
I do agree, Vita had one of the best launch line ups ever. I think the point I'm just trying to make is that the system wouldn't be in the position it's in if Sony had more games lined up for the rest of the year.