Which superstar can or will use the Tombstone Piledriver next?
 

And what would they name it? Anyone besides Kane ...

No one on the current roster. In fact with how WWE is today about concussions I honestly don't see them letting anyone use it after Taker is done. Barring that though I could see them giving it to Luke Harper if they were ever to actually push him as a legit threat.

If anyone, I could see Wyatt. If his mania opponent is Kane and he beats him it might set up something for Taker/Wyatt at Summerslam where Wyatt to beat him with the tombstone. Other than that though I couldn't see him using it after that.

When Undertaker's Son AKA The Son-dertaker becomes a rassler in the WWE he will have the tombstone and perhaps old school. They'll def want to keep it real with him. Prob be managed by Paul Bearers kid (not the dead one though)

The Young Bucks