I actually don't think 3DS will sell that much more in 2013, it'll be about the same despite Pokemon X/Y.
But I think y'know, there's still room in the marketplace for 90-100 million 3DS' in the smartphone/tablet world ... and that's not chump change. There's a lot of profit to be made, especially if Nintendo can squeeze Sony completely out of the Japanese handheld market.
Particularily in the West, the 3DS is never going to perform like the DS did, but they can still sell a decent amount of hardware/software.
The 3DS should be the best selling game platform worldwide for next couple of years fairly easily IMO. Playstation 4 would be the main threat to that, but we're likely talking about a system that will start fairly slow with a $400 or more price point and probably not have a ton of inventory until spring 2014.
I would be much more worried about the Wii U. I don't think Nintendo actually really known what they're doing in the console side for several years now, Wii U is not something that just happened with some overnight mistakes. I think in actuality Nintendo is out badly out of touch with where the console market is today.
