Wally didn't exist in the New 52 until majority of the fans basically demanded to bring him back.
Kyle Rayner got depowered and now rarely shows up.
Tim Drake got sidelined as a background character in most Batbooks.
Dick Grayson was basically dead for 2 years worth of books in favor of Ric.
Bart and Connor didn't exist in the New 52 until the bendis's Young Justice. Before that, they were replaced by the wannable Bar-torr and Kon-el.
Roy Harper doesn't even have his Daughter anymore.... and he's dead
Connor Hawke doesn't even exist anymore, still waiting for him to come back.
Any suggestion why?