Well, given Orton's about to feud with Barrett and such... They could push him there.
Also, don't forget the Buried Alive match where Nexus helped Kane beat Taker.
You don't go from Batista, Michaels, and HHH to Wade. You just don't when the streak match is the secondary attraction on the card and in recent years main attraction. Wade isn't high profile enough nor does he have the resume. Sheamus would stand a better shot. The only way they go Taker vs Barrett is if Wade gets a stable and they go BOD destroying them. They also wouldn't trust Wade with Talers body, when they want to get him through the event safely with enough for a few more years to milk.
The more logical choices are Kane, Randy, Sheamus, and HHH.
Henry if he doesn't lose the belt or Show are also better options in terms of credibility. Wade just recently got pushed but he has no resume really, they cold just as easily push Ted in the next month and have abetter back story with his daddy bring brought in.
Even Miz is more realistic since he too is undefeated at WM