So the #WWE #WrestleMania main event is a case of Damed if you do Damed if you don't.
If they keep the belt on Lesnar they are keeping the belt on a guy who is MIA for weeks sometimes months on end. If you look at the numbers Brock isn't a draw. Any type of upswing that may happen doesn't last long and if you look at some of the number they actually go down when he is around. So you have a guy who is barley on the show and isn't a draw as champion hardly something you really want.
If they put the belt on Reigns well your putting it on a guy who quite frankly just isn't ready to be a main eventer. Don't get me wrong I see the potential in Reigns but he's not ready yet. I think he's a year away. It's clear WWE see's Reigns as the next top guy but if you put the belt on him and he flops he may never recover.
Now of course with Reigns if they don't put the belt on him they could give him the rep as the guy that choked and that can be bad as well.