#2 Return of major superstars

Batista recently returned to Raw and started a feud with Triple H and eventually a huge match involving the two was set up for WrestleMania. Batista is a Hollywood star and an appearance from him helps the company garner mainstream attention, and we all know that Vince loves mainstream attention.
We can expect more of these kinds of appearances from former WWE Superstars when SmackDown moves to Fox. The fans love nostalgia, and whenever a former superstar returns, the ratings spike up.
Did you know a top WWE Superstar just wrestled outside the company? More details HERE
We might even get to see some past superstars return on a permanent basis as WWE could offer them much more money than before, due to the billion dollar deal with Fox.
Also, many past superstars are still in their 40s and could create decent matches. WWE could use these superstars to put over new talent and could also create some dream rivalries.