if PS VITA would decide to put google play in their system, would that kill the sale of 3ds and finally kick nintendo's butt on the handheld corner of the gaming industry?

I don't think it's up to PS VITA to make that decision.

It needs system sellers, not more features that can already be used on other devices.

Yup, but change google play to Monster Hunter/Pokémon/Mario/Dragon Quest/Final Fantasy

how about a whole psn collection?

Yeah, bundling free games would be a good idea. At the moment though I think that its greatest problem (apart from lack of system sellers) is the lack of awareness. Sometimes when I talk about the PSV people go "What?", even tough I've told them what it is before.

PSV need to make itself remembered. Proper marketing would be a good start.

Then they would still miss their sales targets by a lot.

i think it will be a good idea but they need to lower it $50