Nope. Not that I desire for it to happen, but Punk is the best candidate on the roster currently to do it. And part of me feels the streak ending is too big of a moment to pass up.
If Punk wins, at least we can be certain that there's zero chance Cena beats the streak next year. I'd absolutely love the heat that a Cena/Undertaker match would have because of people thinking Cena of all people could defeat Taker, but I'm not sure it's worth it given the probability of it happening. Never forget how much of a streak killer Cena is - ending JBL's long title reign, Muhammad Hassan/Great Khali/Umaga's undefeated streaks (not counting a DQ loss in Umaga's case), etc.
I thought WM30 was a perfect place to retire because of it being the 30th anniversary but instead, it could very well be the case where Taker is the main inductee for the HOF. When they bring out all the HOF inductees from the previous night, Taker could make a special entrance one final time for the audience by making the lights go off and suddenly appearing in some special fashion, just as he's done a bazillion times before (it never gets old for most people, it seems.)
I've had a lingering feeling for awhile that Punk will be ending the streak but most likely, he simply comes close and maybe turns face because of fans (and probably Taker) showing respect for him because of how close he comes to ending it. (Or perhaps just Heyman berating him and having Lesnar attack and break his arm like a twig with the Kimura.)