Voted triple-threat mainly because I think that's what's going to happen. A triple-threat makes sense due to the doubt about Cena's ability to work with the injury. If it looks like he won't be able to go at HIAC, then I think it will be Punk-Ryback. Knowing Cena and his amazing recuperative powers, I figure he'll be able to work at least a limited match, which would cause the necessity of a triple threat. I don't see it being one-on-one between Cena and Punk.
As far as I'm concerned, there are three questions that have to be asked:
1) Is it time to take the belt off Punk? Can he still call himself the "Best in the World" without it and make his points? (Yeah, I know, that's two questions...sue me)
2) Has the Punk-Cena feud got enough steam to continue without the WWE Championship?
3) Is Ryback capable of carrying the belt and is there somewhere for it to go with him as Champion without Cena or Punk being the number one contender (as their feud would continue)?
If the answer to all three questions were yes, I would suggest that there should be a triple-threat and Ryback should win it. To me, the only one with a yes answer is number two. These two guys work so well together and bring out so much of the best in each other that their feud has grown beyond the title.
But, taking the belt off of Punk is a bad idea. The whole point he has right now is that, as WWE Champion, he's the best in the world. If he loses that, he'll lose the heat he gets from fanboys/girls and they'll be back at square one with building his heat among the majority of the fans (no doubt he can do it as he's tremendous at playing a heel and he'd be playing against the uber-face of the company in Cena). The other issue is that I just don't think Ryback can carry the belt (and, in effect, the company) without Cena or Punk to work against. We'd be going from HIAC to Royal Rumble without someone credible for him to work against in the Rock. Besides, I think the fans are dying to see Punk against the Rock. And there's a natural feud beyond the belt for those two. I think there's a triple-threat and I think Punk retains, probably by being the guy to finally pin Ryback, which will just build his "best in the world" credentials further. Then, we'll get a feud blowoff match at Survivor Series between Punk and Cena, where Punk should end up going over clean.
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