The Undertaker starts off the list because, as exciting and as interesting as a feud with Roman would be, the chances of it happening in 2016 are the smallest out of anyone on this list. Still, it's a possibility and one that should be heavily considered for WrestleMania 32. In a previous article, I discussed 5 ways to maximize interest in this year's WrestleMania. Without spoiling the top entry of that list, I'll just say that WWE could do worse than by utilizing Roman Reigns in the previously discussed role. With Reign's current plans for Dallas appearing to lead towards another future Hall of Famer, The Undertaker doesn't have much time left to face the new WWE kingpin. It is very possible that 2015 was a farewell tour of sorts for the Deadman and if he were to go out at this year's WrestleMania then a feud with Reigns may not be in the cards. Knowing how big of a draw that match would likely be, it's hard to imagine WWE just leaving that money on the table. For that reason alone, Roman Reigns vs. The Undertaker would be a great choice to headline WrestleMania 32 or beyond. It's far from a sure-thing, but The Undertaker challenging Roman Reigns (or would it be the other way around) is a possibility for 2016, the only thing that prevents it from being higher on the list is the uncertainty of it actually happening.