I don't know, sounds debatable.
I think people are definitely overstating the importance of power to gameplay. Mario 64 started out on SNES, after all. Mario Galaxy could have been faithfully translated to N64 with similar enough gameplay but absolutely crushed graphics. N64 is just on the border between "you could demake a game for this with the same gameplay" and "you could demake a game for this, but it would have to be totally overhauled with core mechanics removed".
That said, I think Breath of the Wild would have been a bridge too far for the poor Wii, we simply don't have evidence of games of that scale, and the thing with BOTW is the hugely increased RAM, faster GPU and CPU compared to the Wii is what ENABLES a lot of its CORE mechanics, like the persistent state of the world, the physics, the wind and weather, etc. While Nintendo made poor use of it, Wii U was definitely a case of a console so much more powerful it opened up new gameplay opportunities.
But Wii U something like 10x as powerful as Wii, Drake is "only" 3-6x powerful, we won't see quite the same "generation defining" leaps like BOTW or Sunshine. I think the focus will be mainly on having it run Switch games better, with every game they can conceivably squeeze onto the original Switch going to both for years to come, until Switch becomes too outdated to function, like the 3DS and Wii U's security features being too weak for modern payment methods or the DS too old to support modern modems.