People (including myself, an avid Vita fan), have been predicting the death of Vita for over a year now, and the roster keeps getting better.
If you see it not as what we thought it was gonna be (or what was promised to us), but as what it is and can be, the Vita is not only fantastic, but a great candidate for a legacy device as well.
Fact of the matter is, right now it may be easy to have both PS3/PS4 and a Vita, but the time will come when that won't be a reality.
Then, all the games that are cross-compatible will be played, I think, on Vita more than on home consoles (much like the GB and GBA are getting much more play time than NES and SNES).
Another thing that is interesting is that that announcement named "first-party games" support. And being honest, that was never the strong point of the Vita anyway.
Third party, medium sized developers are the life and soul of the Vita, with indies a close second. And to be quite honest, aside from a couple of exceptions (a new God of War, a new Uncharted), I really don't miss the AAA+ titles on my Vita. Simply because they appeal to a type of gamer different than myself.
I don't like multiplayer, and that's where the AAA+ bucks are going these days.
So, all in all, the Vita, if anything, is living far beyond the expectations of the industry and the market from a year ago.
And for me, as a recent(ish) adopter, I could not be happier with my device (been about 6 months).