There's little reason for Sony to keep pushing the Vita outside of Japan. That said, I doubt they'll discontinue it entirely. It'll just trundle along for a few more years.
As long as it isn't costing Sony money (Which it probably isn't, due to no advertising or 1st-party game development) there's really no reason to kill it completely.
"Never argue with stupid people. They will drag you down to their level and then beat you with experience."
-Samuel Clemens







