It would hurt sales somewhat, I have little doubt.
With the Playstation 4, the general public knows instantly what they're getting, generally speaking. It's the fourth generation of Playstation video-game consoles. There is no chance for confusion.
"Playstation U", however? Ick. No one would know what the heck it was simply by hearing the name. That would have been an absolutely awful idea. Honestly, there is no need to change what works, especially not simply for the sake of being different.








