I was on the fence about it, leaning towards probably getting one. But when I found out about the memory cards, that pushed me back the other way.
To add to it, no matter how awesome it might be, like another poster said I'm done with small screens.
I like large screens. I use a projector, 50" plasma, and I like playing my big red cab only a foot or two away from the 25" screen. Hell, even my computer monitor is a 24" flatscreen.
When I do travel, I'm usually too busy to mess with gaming. Sitting at the airport here or waiting there I may have some limited time to play, but it's not quality time at all. Even then, I do have a DS xl and a PSP with more games than I'll ever play for them, so it's just not in the cards for me to get the Vita regardless of how awesome it might be.
Aside from all of that, I'm kind of anti-digital copies of games. If someone wants to have that, I've nothing against it. For me personally, I like having the games and their cases on my bookshelf for display when not in use.