8. Build Towards An Eventual Reigns vs. Cena Feud
Maybe this could happen at WrestleMania 31, if neither man had anything else planned - although it seems quite unlikely, particularly with WWE's barely-disguised title aspirations for Roman. However, it's never too early to sow the seeds for an eventual feud somewhere down the line, particularly one as potentially interesting as Cena vs. Reigns. Big Match John is thought to be returning just after Christmas, opening the door for a brand new feud. He could well set his sights on Alberto Del Rio, intent on winning back his US Championship - but I'd rather see a little tension brew between the two biggest babyfaces in the company. This could lead to one man eliminating the other at the Rumble, resulting in a torch-passing match at WrestleMania. However, if other 'Mania plans understandably get in the way (such as the rumoured Cena vs. Undertaker match), it would still be sensible to keep discontent between the two on the backburner.