#1 Roman Reigns.

Believe it or not, Roman Reigns is the man with everything to lose in this scenario. Of course its possible that WWE finds a way to get Reigns over, but if they aren't able to, what does that say about Reigns future in The WWE? In fact, if he fails to get over with The WWE Universe after repeated tries, what does that say about his capabilities as a superstar?
In the end, if Roman Reigns fails to connect with fans after multiple attempts, its going to put a black mark on the rest of his career. Even worse then that however, Reigns could be responsible for WWE's decline if they continue to push him, which is going to rub fans the wrong way and eventually cause WWE officials to give up on him.
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Maybe WWE will learn their lesson and stop pushing him before its too late, but if they don't, the consequences will be dire for Reigns. Who knows! It might even be enough to release him to being a mid-card superstar for the rest of his career, which would be a huge demotion from what was originally planned for him.
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