#2 Better opportunities
You're only lying to yourself if you think that there aren't better options this match. Yes, it might be a dream match on the same levels of Undertaker versus Sting, Finn Balor versus Brock Lesnar and AJ Styles versus Shinsuke Nakamura, but its also one that pails in comparison when you think of the other opportunities here for both superstars.
For example, WWE could do something like The Undertaker versus Finn Balor or Undertaker versus The Miz, which would no doubt do something to boost both superstar's profile in the company and could lead to a title run if done right. Not only that, it also gives them one of the biggest wins of a lifetime.
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And then there's John Cena, who would be much better off in a match against Jinder Mahal or Baron Corbin, which could also be a great career booster. In fact, John Cena's age, and title run last year makes him a much better candidate for a torch passing moment and that would truly be a WrestleMania moment worth watching!