Vita is done. Even in Japan I don't forsee a big comeback, Nintendo's next handheld will be out there in 2016 and that will kill whatever is left of the Vita.
3 million is just too puny of a userbase even for Japan and Vita is already showing signs of YoY decline.
Nintendo's next handheld will likely be a good deal more powerful (to accomodate the Fusion idea) than Vita as well, so a lot this support the Vita currently gets will likely shift over.
If I'm Nintendo though I've already locked down deals for Monster Hunter 5 and Yokai Watch 3 as well.
I think Sony in general will abandon handhelds fairly soon, they are going to shift focus over to battling MS in the West.
Nintendo basically must wipe out whatever is left of the PSP/Vita in Japan, they need all of Japan to support their handhelds because under seige from iOS/Android, Nintendo needs to galvanize what's left of the portable market under their banner.
