I am blind in one eye (since August 1991) and therefore will never see true 3D again, nor will I ever be able to enjoy 3D movies that require 3D glasses. I feel that they WILL use this sort of 3D in the next Ninty handheld system if these 3DS announcements are true, for a lot of reasons:
Even though I am forever locked in a world of 2D sight, the images in that vid look 3D to me when they tilt the screen around. Yes, I know they are only 2D images that "appear" 3D, but I will take what I can get. If the "3DS" system makes every new game have that effect, and it can be turned on or off on-the-fly, I might actually consider buying it because I think the system would be a huge success. I can even imagine them re-inventing 2D side-scrollers or shmups with that pseudo-3D effect.....actually, I can imagine quite a few older genres of games that would get a real kick in the butt from this type of "instant" 3D enhancement. Could you imagine running around in a Castlevania game, and everything had that 3D effect added to it? That would be sweet...in so many games!
The biggest bonus of the method they demo'd in that vid is that it doesn't discriminate against people with only one eye, everyone sees the same pseudo-3D image, 3D impaired or not. It also makes it where they can use simpler, less intense graphics methods to achieve a higher level of "3D-ness" very easily. I guess that depends on how power hungry that pseudo-3D effect is though. Even if it's just a "gimmick", it's a really good one. If they use it, it will sell.
Being the dirty rotten pirate I am though, I will wait until there is some sort of flashcart or other SOLID method of playing backups on the system before I'd buy into it. Free is better than paying.
In fact, they MIGHT find that the system won't sell too well if people can't ever pirate its games.