I think Undertaker will be at Mania and it will be his final match. Reason 1: He is falling apart literally, he hasn't got it in him anymore. Reason 2: Paul Bearer is back, and Undertaker has said he wanted him around for when he retires so I'm pretty sure this is the beginning of the end.
I am torn as to how this should go, as I am someone who feels the streak should end. Fuck tradition, streaks are meant to be broken and in a wrestling sense no one else will benefit from an unbroken streak except for the Undertaker. One defeat is not going to hurt his legacy at all, and I am willing to bet that WWE will go bankrupt before someone beats Undertaker's streak. Whether WWE decides that he loses though is something I can't say with certainty.
So the question is who does he lose to? An established star such as Cena or Lesnar or someone at the start of their career like Barrett, Sheamus or Miz?
The pros for Vs Cena is that it is the match people have wanted to see for a while now and could cement the biggest heel turn for Cena since Hogan in 1996 if Cena was to win. The negatives is that I can't see this being a classic, we've been spoilt as wrestling fans with the last two WMs having him wrestle arguably his greatest matches of his career. Shawn Michaels could probably make Santino look like Tito Santana circa 1985 if he wanted to. Anyway my point is Cena obviously isn't as good as making others look great as Michaels is so it probably won't be a classic. However this won't stop me from watching it with great interest.
Vs Lesnar gives the match a huge interest from people who watch UFC and in many respects is a dream match also. However I am sure that if this happens it'll be for one night only for Lesnar and really would be a slap in the face to all the great wrestlers who didn't break the streak if Lesnar were to win. I really don't think this match will happen though.
Vs Sheamus/Miz/Wade Barrett. Though these matches would lack the star power of the likes of Cena or Lesnar I think they would still be interesting as it would be the biggest match ever for these young guys. They literally would have grown up watching Taker at WM so you know they are going to work their hardest to put on the best match ever. Also Undertaker has said before he retires that he wants to put over a young guy and "give back" as it were. Can you imagine how that is going to look to say you ended the streak and retired the Undertaker at WM? That just gives you credibility it would take years and years to earn so it would be incredible for one of these guys to beat Taker.
Anyway though my heart says go with a younger guy my head tells me Cena so that's what it'll be for Mania.
In the event of Undertaker actually being injured it will be a heel Cena vs face Orton as the main event.[/QT Taker should go out a winner. Taker has beaten Kamala, Triple h, Diesel, Michaels, Orton, Psycho Sid all at mania to name a few if they couldn't beat him, how stupid would it be to let anyone especially somebody new like Barrett, Miz, Sheamus defeat him? In the end the streak would mean more unbeaten then it would for anyone to beat it. Goldberg's WCW streak meant more than this.