Call me crazy, but no one has mentioned Jinder Mahal. There was that whole, "I want Brock Lesnar!" thing back in November, before Survivor Series. But Jinder dropped the belt to A.J. at a house show before SS, so we got Brock vs. A.J.
Personally, I love Jinder's gimmick -- from his entrance to his mic work. He's become an amazing talent considering he went from a nobody to a main eventer... possibly with some non-natural enhancement, but I digress.
Considering the amount of people in India who watch WWE, and the company's apparent need to continue capturing the country's population, it could be a realistic option.
Keep in mind the shock and awe factor when Jinder beat Randy Orton last year at Backlash. If he beats Lesnar, we all might collectively lose our shit.
Putting the U.S. Championship on Jinder at Mania thrust him back into the main event picture and makes him look strong again.