Vita's future is pretty sketchy other than niche Japanese games. but there's more than enough released on it as is that it's a worthy purchase.
Easily more worthwhile content than Wii U, and that system seems to get a free pass (it too has a sketchy future), so the "no games" argument doesn't hold up, unless you have horrible taste in games or don't really know anything about video games.
3DS is amazing too, but anything on 3DS could be better on Vita - where as Vita offers experiences like Hotline Miami, Tearaway, (those two preferably with a good pair of head phones), Virtua Tennis 4, Gravity Rush, the best hand held fighting games of ALL time (Blaze Blue, Capcom's fighters, Mortal Kombat), the best hand held racing game of ALL time bar none (NFS Most Wanted), the best FPS of all time on a hand held (Killzone M), etc. that simply could never, or have never been done as good as the level they are on Vita.
You have to own one & play video games without bias to get it.