I personally feel Nintendo is walking on thin ice with their Wii U. They need it out cause they abandoned the Wii, but they also don't have a good cause to get those Call of Duty and Halo teenagers to switch over. If Nintendo can hammer out a very robust online in time for launch (Which I highly doubt as it took Sony a good 4 years to do that with PSN and Nintendo is a lot farther away compared to what PSN even launched with), then they may be off the ice. As far as handhelds go, the 3DS will sell well, but it'll be a far cry from what the DS sold. there's just too much competition in the mobile space. I personally think the next Nintendo handheld will be the last unless they turn into a phone.