Marketing
No one is silly enough to see Xbox "One" and think MS is reselling their system from 2001...

One of these 2 looks and sound like a peripheral. The other looks like a new console and reads like one to, with "One" actually being used by HTC aswell as they're premium device, its carries a finality/a completeness, "U" on the otherhand..... Beyond that the name was one of the Wii U's problems, it wasn't the biggest.







