#1 His time is done
We had to say it. It's like the elephant in the room that needs to be addressed, and while some people don't want to admit it out of sheer respect (and again, we don't blame anyone), the truth is that The Undertaker isn't done now. He's been done for a long and it's showed with each and every deteriorating performance.
The last great match you could argue that he had was against Brock Lesnar at Hell In a Cell 2015. Even so, many believe that WrestleMania 30 should have been his swansong, and we agree with that.
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He's simply reached an age where his body doesn't allow him to perform at the level he used to. That's perfectly fine, and he's stated that if fans felt like he was going on for too long, he would hang up his boots.
It's believed now that he has finally quietly retired, and if so, we're glad to hear it. The Undertaker doesn't need to wrestle anymore. He's earned his retirement more than anyone.