Undertaker vs. Sting at WrestleMania 32 has to happen ... right?

Undertaker returned after a year away and wrestled a good (but not great) match with Bray Wyatt at WrestleMania 31. Earlier in the evening, Sting wrestled for the first time in a WWE ring, losing to Triple H. Though the results were different, and you could argue they should have been reversed, both looked incredible relative to how long they've been in the business.

Combined age? 106 years old.

Despite this, neither is ready to retire. WWE ran a Network exclusive interview with Sting that included his saying he isn't sure what the future holds but whatever WWE throws him he'll reach out and grab. Meanwhile, there are reports of Undertaker telling people backstage at WrestleMania 31 that he feels great and intends to work WrestleMania 32. Not surprisingly, he was included in the first promo that dropped hyping the event.

In addition to all that, the two were spotted hanging out at an airport together while reports floated that they shared a locker room and discussed the possibility of working a match. Sting has long made it clear that it's his dream encounter, and while he did say he believes the Triple H match may have been his last, he's not shutting the door completely.

And that's likely due to Undertaker sticking around.

So why not finally make it happen next year? WWE has to pull the trigger on this, right? Or is there a strong argument against it?