Your point is not stupid. Of course Nintendo tried to retain a brand name this generation but that didn't work for them because of substandard marketing. Wii 2 would have been an awful, yet superior name to Wii U.
I think Nintendo's next home console does need to be a complete rebrand, both in name and just in revamping the image of what Nintendo is. Then if that's a success, maybe it's a brand they can stick to.
However, no slogans! Slogans suck.