I was an early adopter of the 3DS. Having said that, I was worried for quite some time about that decision, because of its poor launch. Over the months I've gotten more and more optimistic. Needless to say, I'm beside myself with its current success, and I love the damn thing. Couldn't be happier.
Despite this, I'm a bit sad for the Vita. I wanted the 3DS to win out, sure, but I still wanted the Vita to succeed to some degree. I think it had the potential to be something special. They're in a somewhat similar situation as the 3DS was, but the 3DS didn't have any competition at the time of its struggles. The Vita couldn't be launched at a worse time--right after the 3DS surges in sales, a worldwide launch subsequent to the holiday season, and in the same month as Monster Hunter Tri G in Japan.
I'm not going to blow my load this early and say the Vita is doomed, but I'd say it would be optimistic to say that it will do as well as the PSP did.
*My signature from 2011 which I'm too lazy to change*
Currently awaiting the arrivals of:
Kid Icarus Uprising
Resident Evil: Revelations
Tekken 3D: Prime Edition
Metal Gear Solid: Snake Eater 3D
Beyond the Labyrinth
Heroes of Ruin
Luigi's Mansion 2