#3 Lack feasible opponents

Everyone knows that a match is only as good as the opponents competing in the ring and a Shane McMahon versus Daniel Bryan match doesn't sound very good at all. Maybe that's due to the fact that WWE is going to most likely want Shane McMahon to come out the winner in the match, but also because the two would be very limited in what they could do.
Again, Daniel Bryan can't wrestle the same match that he used to be able to, due to injury and while McMahon has been known to have great matches in the past, it's only been when he had a worthwhile opponent in the ring. Unfortunately for McMahon, WWE and the fans, Daniel Bryan can no longer be considered that kind of opponent.
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Some might believe that WWE could simply put someone else against Bryan at WrestleMania 34, but with Shinsuke Nakamura versus AJ Styles reportedly being the plan for The WWE title and The Miz now on Monday Night Raw, there aren't really that many opponents to choose from.
WWE could try to put him against Brock Lesnar, but that would probably result in injury due to how rough Lesnar has been in the past and Bryan really doesn't need one last injury heading out the door either. In the end, if Shane McMahon is the only option for Bryan at WrestleMania 34, they should probably scrap the idea entirely.