3) John Cena vs Dean Ambrose: Intercontinental
Championship match

Looking at how WWE's storylines are moving, you would call me crazy for writing down this match, but let me explain.
Cody has no chance against John Cena? Details HERE
As the rumors suggest, Seth Rollins will be dropping his Intercontinental title to Dean Ambrose at TLC to set up a clash with Brock Lesnar for the Universal Championship. This means we won't be seeing Seth vs Dean at Mania. If the rumors happen to be true, what would it be mean for Dean?
On the other hand, John Cena is just shy of an IC Championship win to achieve a Grand Slam. So why not do this at the Grandest Stage of them All?
Dean Ambrose is currently one of the best heels in the company and in order to develop more, he must have a feud with a big star like John Cena. Remember how Seth Rollins emerged as a top heel thanks to his feud with John Cena? WWE must plan something similar but it would be way better than John-Seth feud. I can guarantee you that.
A sadistic lunatic vs Mr. Hustle, Loyalty, and Respect. Can it get better than this? This would be a great way to put over Dean as one of the greatest heels of the new era. I hope WWE doesn't put Dean back in mid-card, which would just ruin his perfect heel turn. If we don't get Seth vs Dean at Mania, this match could happen.