Wow i'm surprised you guys haven't figured it out yet. The 3DS is just a test run for the big boy and let people get use to glassless 3D. Mark my words, the next Wii will have stereoscopic 3D, and will be called..... "Wii3D" or "3DWii"
Not enough of a pun - cue 3Dii. :P
Seriously though? I'd predict a new name. If other companies are just churning out bigger numbers to the same name - a Nintendo [insert name here] would probably stand out a bit more.
Plus, another decent gimmick like motion control? It'll sell unto the masses anyway.
The true test of any scholar's work is not what his contemporaries say, but what happens to his work in the next 25 or 50 years. - Milton Friedman.