Game support alone is far from the extent of its problems. Serious lack of marketing, a price tag that was too high and took too long to drop, memory cards that are still ridiculously expensive, and the 3DS has basically achieved Western dominance before the Vita had a chance to come back. Sony could put every studio they have to work on Vita games at this point and it wouldn't make much difference in Europe and North America.
Agreed, but all fixable problems.