It does seem cannibalistic for N6 an 3DS to share their first holiday on the shelves. The only way I can see it working positively is if 3DS and N6 have some very direct compatability, and 3DS being a controller for N6 would support that. The only thing holding it back in that regard is the lack of a second analogue stick, and 2 more buttons. I think 3DS will be used to stream Virtual Console games, and maybe some other features, but it can't really be used for normal N6 games if it's lacking inputs.
Not bothered about the name, it sounds less dumb than Wii did at the time, so I think saying that it's going to have a negative effect on the console is a bit.... Xstream... yeah...yeah? No.

God that song was annoying.