The standby time seems to be remedied by turning wireless off, by the way.
Uh, no, it's not going to be less of a gimmick when X and Y come out. There isn't anything in X and Y that needs to be in stereoscopic 3D. The only game I have seen that actually benefits functionally from 3D is Super Mario 3D Land, and that's only in a few areas. Pokemon X and Y aren't going to vindicate Nintendo's penchant for gimmicks in any way.
I always have wireless off unless I want to use the e-shop, and then I turn it off right after. The standby is still pathetic. I can't even leave it on standby overnight without it being dead when I wake up. I could leave my PS Vita on standby for over a month and I could still play a game for an hour when I finally use it again.