#3 Nothing

AJ Styles has been a champion for a long time now. Unlike Brock Lesnar, he's been a fighting Champion and the rigors of the road must have taken a toll on his body. Styles may use Survivor Series as a pit stop to rest and recover before his return. The life of a WWE Superstar is tough and that of a Champion is tougher.
Who knows? This could even be the reason why he dropped the title to Daniel Bryan, at least until he can come back at full health. The card is so stacked at the moment that Styles may not even be missed if he sits this one out, for the time being.
Styles performs at the highest level every night. He's perhaps the best wrestler in the roster as well as the hardest working one.
He deserves a rest period...