I understand what you're saying,
But you must be on crack to think WWE would even consider having Sting end the streak at Wrestlemania 30,
THE ONLY WAY Undertaker loses and the streak ends : So that his legacy is passed on to a younger promising talent that will brag about it for years to come, like Orton did with the "Legend killer" gimmick. But to think he will give away his streak to Sting, a guy who's a couple of matches away from retiring and never joined the WWE would be a slap in the face to everyone, even my sister who doesn't give a shit about wrestling would be like : " DAMN SON! THAT'S SOME COLD SHIT! "
Tbh, If I had to be pushed to name someone who I think would benefit from ending the Streak, it wouldn't be Roman Reigns since he seems more of a Tweener/Face type and can actually take over Taker's role as the Last Outlaw type(that Final guy who comes to save the day when All hope seems lost, BadAss Take-no-Prisoners style, not SuperCena style).
It has to be someone who can benefit from it in order to become a hated,powerful,credible heel character for some years to come.
That character would be Bray Wyatt AND the Wyatt Family. However, Bray Wyatt has been fast tracked with a feud v Daniel Bryan(Most Over guy on the card) where he went over at Royal Rumble, and now John Cena.
If WWE was willing to take a risk and put their eggs in the Bray Wyatt basket for this Mania, I think Bray beating the Undertaker would have been perfect for his character, as he seems to be a creepy type as well.
Have the Wyatt family help him out in the match, but have him go over Taker and put an end to the Deadman forever.
Instant heat for him going forward, and it would build his and his group's Heel credibility up Big Time as well provided the Character of the Wyatt family is handled properly, which is the BIG risk with having up and comers breaking the Streak, as it can result in a letdown if the resulting rub doesn't go the right way.
Other than that, I don't see anyone else worthy of ending the Streak.
