Its just way too early to tell. Taker may not be able to go for long, but the rub of cleanly ending the streak means Leaner can really put guys over if used correctly. If he doesn't lose until WM, whoever faces him can get made by that one victory.
It wasn't just Brock that got the rub, either, it was Heyman, too. His association with the King Of Swing will elevate Cesaro, if done correctly, and there's no reason he can't help push other guys with it in the future, too. He's constantly got the "mastermind behind the end of the streak" in his back pocket for every heel promo now, too.
The match itself will be remembered as not being a fitting end for the unbeatable Taker, unfortunately, this concussion he suffered robbed it of that. He had better WM matches, and better matches with Lesnar. The image of the crowd when the referee counted 3 was amazing, though. I haven't seen an audience shocked like that in a long, long time.