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Definitely a game changer. But it has to be marketed correctly and have the right price.

Wii U is the natural evolution of the Wii. So, this is not a revolution, but an evolution. The Wii U isn't a console of the 8th generation, it certainly isn't innovative and doesn't have the strongest specs.
The Switch, although without any official information or an announced price looks very promising. I think it has some advantages that will make it a hit.