#4. Roman Reigns wins, setting up a Universal title feud down the line
Roman Reigns and Seth Rollins are both babyfaces so we'll be seeing all the handshakes and hugs post and pre-match. It would be really interesting if WWE decided to have Reigns go over the Universal Champion clean.
It's been a while since Roman Reigns has had that big victory but that seems to be by design since he isn't being as heavily featured and pushed as he used to. If he did beat Seth Rollins clean, which he has before, then it could set them up for a future Universal title feud, granted both superstars end up on the same brand.
It's a bit difficult to imagine a scenario where Roman Reigns and Seth Rollins are in the same brand. It would seem a bit unequal since they're clearly now the two biggest full-time babyfaces in WWE.
It would likely mean a switch to RAW for Reigns, but that seems a bit too soon.