The issue is that people have to own a Vita in the first place.
Always so harsh jman One million+ have one already, that' something!
And while the "ps3 in handheld" format is not at sound argument in USA for example, when people prefer the TV experience for the console games, in Japan is something that could work. Here is a desirable PS3 game in your handheld, isn't that attractive for many Japanese users?
It's just a possibility, not claiming it to be the saviour of Vita, but I think the theory is not bad applied to the Japanese market.