No, the Wii didn't do any damage to the brand. If anything it repaired some damage caused by the disaster that was the N64.
Wii U isn't failing because of the Wii. It's failing because Nintendo made a successor to the Wii that failed to succeed the Wii in every way. Heck, a lot of people didn't even understand it was the successor, that's how hard it failed. Nintendo also did their best to kill off every last bit of momentum by leaving a huge gap between the death of the Wii and the birth of the Wii U, effectively minimising the chance of a smooth transition.








