I wouldn't have released the New 3DS in the first place, and saved that R&D to the actual next generation handheld. The 3DS doesn't need that kind of fragmentation.
The Wii brand became 'toxic' (whatever that means) after they confused consumers with the stupid U name and a weird low res tablet controller. Putting 'Wii' in the title was never an issue; the marketing and execution is where Nintendo screwed up.
I don't think there's anything wrong with the New 3DS name. We live in a world where Apple announces a "new MacBook" that isn't the MacBook Air despite being even thinner.
After a long day of work you have a lot of options to get relaxation and entertainment from. So does everyone else in your family. You want something that can bring everyone together and keep everyone smiling. You also know that not everyone likes video games so as long as everyone can stay in the same room together and be happy and not have the console hog the TV by having a seamless screen on the controller. So many people just want a cool name without considering what the intention of the console is.
The word super isn't cool anymore. The codename we were calling the system before its reveal, the stream, sounds too much like a pee joke and the Wii already had too many of those.
Now I kind of like the Nintendo Union or Unity because it bring people together, but it can't be named those for legal reasons. But here's a crazy and kind of dumb idea: why not just call it the Wii. Families already are familiar with the Wii even if they may have drifted away from it. Or even call it the Next Generation Wii with the first bit in small font. It might cause some confusion but at that point people were used to their phones upgrading without getting a major shift in their names.
Or here's an even dumber thought, call it the N6 because it's the sixth major home console from the company.
Actually, after writing that I'd probably just call it the Wii U too.
I don't know about the 3DS though. I like the silly name but it's already a mouthful. It needs a name that can signify that it's the same great system millions of people already know and love but with more features and power. "The New 3DS" does that without trying too hard.
Looks like I'm bad at naming systems, but it's not like any video game system has ever had a great name.
I would have called the New 3DS the 3DSN (N standing for new obv) or the 3DS+. As for Wii U, I have no idea. Super Wii sounds absolutely awful and dated, and Wii 2 would make it sound like it was only Nintendo's second system so it would look even lesser next to the PS4 (not that it doesn't already). Nintendo U might have been a good name for it.
Well, I'd have called the N64 "Ultra NES" then when we wanted a rebranding I'd have called the GC something else, then Wii would be Super GC and Wii U would be Ultra GC in keeping with that tradition. Of course replace GC there with whatever GC was changed to
I'd say heavy marketing of the gamepad with little to no footage of the console may have contributed to that. Especially with use of previous wii peripherals like the motes and the balance board. Just look at their first commercial: "New Controller" is the entire theme.