Now what would be HOT is if the developers did "The Last of Us: In the Beginning" like a prequel to show how the mold spread, why did it mutate to humans, how did the pandemic start and what the planet/people/animals/plant life was doing as the parasite progressed.
They could use the Vita to do that for all the various games that have strong stories ....kind of like how the Walking Dead 400 Days is not the actual season 1 or 2 but tells about what happens beween those times from 5 different perspectives.
It won't happen, but I agree - The Last of Us on the PlayStation Vita would be pretty awesome... Again I don't think it'll happen, but IF (and that's a pretty big "if"!) Naughty Dog were to do a PlayStation Vita game from the same series, it'd be a prequel or a sequel.
More likely though, you'll see future "The Last of Us" titles on the PlayStation 3 or (more likely) PlayStation 4...