#1. The Undertaker told fans he was retiring during his Last Ride documentary

At the end of the day, it really comes down to whether The Undertaker told the truth during the final moments of his Last Ride documentary. While it would admittedly be exciting to see The Undertaker in the ring again, one would have to imagine that his comments during the documentary are his true feelings on the matter. During the final chapter of the Last Ride documentary The Undertaker said:
"Never say never, but at this point in my life and in my career, I have no desire to get back in the ring. I'm at a point, it's time this cowboy really rides away. There's nothing left for me to conquer."
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Again, it would be cool for a moment to see The Undertaker in that role one more time for WWE, but why even try if doing so ruins the image of the legend? Keep in mind that Undertaker said he has nothing left to conquer inside the ring and unless that changes, it's just not going to happen.