Why are more people buying other systems? Isn't that the easiest question in the world? Those systems will eventually have more games that more people enjoy than the Wii U has and consumers know it. It really is just that simple. Anyone in denial about that needs to get over themselves. No, other people aren't gaming wrong just because they like games on other systems better than the games Nintendo makes. People like different things.
The best thing Nintendo can do? Start paying attention to what their competitors are doing and how consumer expectations are changing. Then, with that in mind, they start working on their next console and their strategy going forward. The Wii U probably shouldn't be their priority at this point.
Honestly, if it were me, I'd put my "A-team" developers on next-gen projects once they're done with their current Wii U projects and I'd fill up the Wii U's remaining schedule after Zelda with more titles like Splatoon. I'd have younger talent experiment with new, original IP that, if well received, could become continuing franchises. Use the Wii U as a proving ground. Throw some pudding at the wall and see if anything sticks.
One thing for sure is that I would give the Wii U's successor one of the best launches in history. A fast start if vital in order to restore faith in consumers. Good first impressions and all that. And, for the sake of all cats, if the strategy is again to be much weaker than the other systems, then do NOT feature an expensive gimmick/innovation.
