It's not about making punk look credible to me
It's about having a young wrestler in his prime jobbing to a 100 year old part timer who wrestles once a year.
Punk winning would be enormous, what does it do for Taker who we wouldn't see for a year if he even comes back.
Who gives a shyt though, really...
People worry too much about the most irrelevant shyt, what is losing to the Undertaker at WrestleMania gonna do to CM Punk that it didn't do to anyone else who had a match with him at Mania, and people KNEW they weren't gonna win? Nowadays, Undertaker's Mania match is like an event in itself at the event... being the person to have that match with him alone will be a great spot for Punk to be in. That ALONE at this point puts him in a different class than the average heel on the roster. It's more about the match itself than the result.