Let him face john cena at wrestlemania for the title (imagine the heat on cena)..
bill the undertaker as losing his "powers" staring right before the rumble. Let john cena eliminate him from the rumble (wether cena is in it or not) have them bantar back and forth and cena get the best of him again and again due to the loss of the powers.
Have the match at WM this year. Let cena beat down taker throught the first part of the match, have taker mount somewhat of a comeback and then right back to cena beating him down. Let cena hit the AA and stand over the undertake doing the throat slash gester (saying he will end the streak with taker's own move).. but then the lights go out
Have one spotlight turn back on and aim it at the top of the ramp where paul bearer will be standing holding the urn, as to give the undertaker the strength to gut it out one more time. Have taker do the signature situp, grab cena around the throat and deliver a chokeslam. Do the throat slash and give him the tombstone to win the title..but its not over
the money in the bank winner from earlier in the night...Kane's music hits. (his old music) he is dressed in the old costume mask and all. As he walks down the ramp fire shoots from the ramp and ring posts.. He gets in the ring cashing in his mitb and dominates taker with a few moves ending in a chokeslam and tombstone. Kane wins the title and the druids bring down a casket. Kane shoves the undertaker in it and wheels it up the ramp. Lights it on fire and tells the undertaker to REST IN PEACE and he is never seen again