#2 Roman Reigns
Sometimes, it just makes sense to put your biggest antagonist up against the biggest protagonist in your brand. I realize that it does seem like Baron Corbin and Roman Reigns are on the warpath at the moment, but Roman Reigns has just been kept out of the title picture for far too long. At a time when more people are cheering for Roman Reigns than Seth Rollins, WWE really needs to capitalize on the whole situation.
Roman Reigns vs. Bray Wyatt just makes a lot of sense, especially if you consider their history together. The two men have clashed in the past, but Reigns is a different man after his battle with cancer and so is Wyatt after adopting a new persona that the world has embraced with open arms. Reigns has also been out of the title picture for way too long.
Reigns brings out the best in Wyatt as we've seen in their previous encounters. Even if this match doesn't happen at Survivor Series, it's certain to take place somewhere down the line.