How many units does Nintendo have to sell before they start making some net gain from the 3DS? Is that information even available? 'Cause really, I see piles of them at every store I go to. It was impossible to find most of the other consoles Nintendo's released over the years for about a year after they came out. They all got snatched up or back-ordered so quickly... But the 3DS is truly in abundance. It almost feels like Nintendo doesn't care. The line-up was just that bad and the 3DS isn't a dramatic step up from the DS, the only main difference being a terrible control stick.
The problem with 3D imaging on a flat surface, is your eyes have a hard time focusing on artificial depth. When artists create art that has depth but is still clearly 2D, or when you see a movie, the focusing is done for you. You always see everything at exactly the distance you are supposed to. In 3D, your eyes will see what they think is actual depth and attempt to focus too hard because the idea of focusing on depth on a 2D surface is unnatural. I imagine you could adjust, but then you'd be a bit disoriented upon returning to real-life 3D. It's a cool little gimmick which can be fun when utilized properly, but 3D is definitely not the future of media in any way. I know the last 3D movie I actually saw in 3D was Tron. Before that, Toy Story, How to Train Your Dragon, and Avatar are all I can really think of. An optical illusion you have to stare at for extended periods of time just isn't really WORTH the extra expense. Even if it was free, in most situations I'd prefer to ditch it. HTTYD was actually better in 2D because any pans whatsoever blurred and caused some queasiness. Luckily, there weren't too many pans in the movie. A shitload of action and stills, essentially, but that's standard in animated films.
Ramble ramble ramble, I gave 3D a shot, and it just isn't cool enough. The 3DS is kind of a fart in the bath as far as gaming innovation goes.