There's only a few million Vitas out there, and it's not exactly a standard architecture. Sad - from an input perspective I'd argue that it's better than a PS4. And yes, there are more Vitas in the wild than there are PS4s, but that's due to change any month now. I can understand why Frozenbyte wouldn't be willing to make that investment.
In the meantime, there is remote play....just don't tell Colin that you want to make a kickstarter out of it