Have we seen the last of The Undertaker? Has he wrestled his final match?

With knowledge of Sting and WWE reaching an agreement, would you want to see a 49 year old banged up Undertaker vs. a 55 year old way out of his prime Sting at Wrestlemania XXXI. On paper, it looks phenomenol, but when you face reality...it's just not something I would honestly want to see anymore.  Thoughts?