If Ryback were to face Punk and lose as I said would be too early for it to end because he just started facing actual talent. Who has he beat other than Swagger, Miz, and Hawkins/Reks? I don't remember.....I think Ryback shouldn't win the belt anywhere, but ppv. Say he wins it at the ppv and they do a 6 pack challenge or scramble match where he dominates all kinds of talent. Get him over at a big stage at Survivor Series. Keep building bricks until he beats all the competition. Best place to have him face a WWE or World champion would be at one of the big 4, but it is too early as I said. Punk can't get DQ'd in a HIAC match which it would likely be in. Best case scenario that WWE hasn't thought about if Cena can't go is to have Orton replace him. Why? Legit backup plan who is scheduled for time off to do his movie. Gets beat up bad in a Cell match, reason to give it to him to film the movie. A W over Orton wouldn't hurt Orton at all. That is the replacement I'd go with.