#4 - Batista

While Batista has expressed interest in returning to the ring, specifically to have a retirement match with his longtime friend and mentor Triple H, it doesn't seem likely that he's going to return for another match due to the amount of success he's had as an actor.
But, WWE might be able to get him back for a Hall of Fame induction, where he would presumably be inducted by Triple H, or even the entire Evolution faction.
Did you know a top WWE Superstar just wrestled outside the company? More details HERE
Would it be a great idea to have Batista headline a Hall of Fame class at MSG? The answer is yes. Sure, a small number of people will probably have a problem with it, but typically, the fans at the Hall of Fame aren't terribly disrespectful to the headliners.