Prediction: A stronger Wii U would have won this generation

[Darwinianevolution]

No. A powerful Nintendo console might have had a better chance to win the gen, but not a more powerful WiiU.

First, I doubt third parties would have supported Nintendo as well as the other two. Most of 3rd party on Nintendo's systems come from japanese developers, that are reducing their software output on home consoles in exchange of mobile. And even if they do, the 3DS would have taken priority, as their main market, Japan, became handheld-centric. I doubt a more powerful WiiU would have convinced western studios: Ubisoft tried and went away, Activision failed with CoD sales, and EA outright boycotted the system due to Origin. If the WiiU couldn't get a port of the PS360 version of GTA V or Minecraft, a more powerful system wouldn't have gotten it either.

Second, most non-Nintendo developers don't know what to do with the Gamepad. Also, a more powerful WiiU would have been the most expensive system of the gen. The gamepad is really expensive, I'm sure it's the thing that is making Nintendo unable to "do a GCube" and making the system just 99€.

Only a couple of Nintendo titles really need power. Only XCX and ZeldaU (and maybe others in the future) wouldn't have been possible on the Wii (granted, not in HD and some specs adapted, but they would have been possible and still playable). Nintendo won't go for the maximum specs on home console anymore, they don't need it, 3rd party needs it. And, like I said, 3rd party doesn't follow Nintendo as they do with PS or XBox.