Sony most likely couldn't care less about the Vita. Everything they're doing indicates that they will not be continuing in the handheld sector for hardware. When you compare the PS4 and Vita's sales, it's obvious why.
Well, in this case why Sony is porting a Resident Evil, funds Grim Fandango, Broken Age or Day of the Tentacle, sign console exclusive deals with all Devolver games like Olli Olli, Hotline Miami, Titan Souls and signs a lot of console exclusives with indies for Vita, brings PS Now to Vita, has PSPlus in both platforms with games, make a lot games being crossbuy etc?
Seems you missed these lists (and all the related announced games signed by Sony to be released on Vita, being many of them console exclusive in Playstation):
http://www.neogaf.com/forum/showthread.php?t=969122
http://www.neogaf.com/forum/showthread.php?t=990806
Since Vita has low sales, doesn't make sense to continue making big AAA exclusive games like Uncharted Gold Abbyss or Killzone Mercenary at least until its userbase grows considerably, and instead makes more sense to release small games and indies. Like in WiiU, isn't profitable for major 3rd party to make expensive games for it.
The best Sony can do is to continue releasing and signing small games for it, to fund some few big names and to focus on Remote Play, PSNow, PSPlus, Crossbuy and similar until they make a price drop for PS4 which would allow to release a PS4+Vita bundle for a decent price.
As of now their teams are (or has been) focused to support the PS4 first years with their first game for it because it's where they have their biggest market, which is logical.
It wouldn't make sense to put Naughty Dog, PD, etc to spend hundreds on millions making games for Vita, it's better to put them in PS4 because it would be more profitable and try to improve Vita sales with stuff less expensive.