#2. Why it's a good idea: It's a special attraction match

The fact of the matter is that no matter how much we criticise The Undertaker, his matches are always special attraction bouts. He has been a special attraction for a few years now.
We also mustn't forget that with regards to The Undertaker, no matter how many people on the internet complain about it, the casual audience very likely still loves The Undertaker beyond belief and are always happy to see him no matter how old he gets or how bad his matches are.
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This is a special attraction match, and don't be surprised if it's the main event as well. Becky Lynch & Seth Rollins vs Baron Corbin & Lacey Evans ideally should be the main event because the stakes are much higher (winner takes all match), but since the star power on this one is bigger, don't be surprised to see it go on last.