I don't know what new home consoles they can come up with, I'm sure that they'll be able to think of something though. They'll just look at what went wrong with the Wii U and use that information to their advantage. Tbh I think a lot of the Wii U issue is probably marketing though.
But like I said, when you've practically monopolised hand-held gaming for years on end it isn't of huge importance whether or not they can revive their home console efforts. Realistically speaking their non-portable gaming has really just been a sideline project for years.