As someone who wasn't fond of Brawl, the new Super Smash Bros. games, while overhyped, are exactly what I was hoping for: games that doubled back on all the dumb nonsense introduced in Brawl. They're what I so wanted Brawl to be in 2008. Brawl was so bad to me that I didn't want Sakurai in charge of the series anymore. I'll eat this crow and take that back. Granted, not everything in the new games is awesome, Smash Tour is ungodly awful and the stage builder is once again a pathetically missed opportunity, but Sakurai and co got the basics right for the most part and renewed my faith in the series.
Anyway, while I agree that Nintendo could stand to be more ambitious, it has shaken things up which is at least a start. Five years ago, Nintendo never would have picked up a game like Bayonetta 2. Sure, the game isn't for everyone, but that's the point. I don't believe Nintendo ever thought the game would be anything more than a niche release, but it funded the game anyway and commissioned a port of the original. It sounds like an admission that it needs more variety and will look outward for it. Again, it's a start.
Splatoon is a title headed by a bunch of younger members that deliberately eschews established characters in favor of brand new ones. I can see Mario showing up as DLC or an Amiibo bonus. We're already seeing a youth movement within Nintendo that is doing its own thing. I'd like to see more though perhaps Nintendo isn't ready to show more yet. The company just opened a new seven-story development studio in Kyoto (it's nearly as large as its headquarters also in Kyoto) earlier this year. I'd be thoroughly surprised if anyone there was working on Wii U titles.
That said, I understand the concern though I'm not as concerned. Nintendo has taken some steps, albeit baby steps, but it's important that those steps have been taken.