I have a Vita. I have a PS3. I can't imagine seeing FFXIV on the Vita do to it's short battery life. It's also heavy, and the touch screen has some flaws (it's nowhere near as a good as a iPhone or iPad touch screen). Remote Play works but it's limited to Wifi only. Right now only GoW collection and ICO/Shadow of the Colossus support the Vita's remote play (which has no latency). But it's far from perfect.

I just don't see this happening. It would be too much work to get working properly in any case. Yes you could do it. But it would be easier to create an iPad version, since the latest iPad is more powerful than the Vita. And I don't expect an iPad version either.