#2 More stacked men's roster

One of the biggest reasons WWE shouldn't bother with Brock Lesnar anymore is the fact that they have so many other young stars that could match or exceed what Lesnar is doing right now. Of course, Lesnar will always have that realistic feel to his career since he is a legitimate UFC fighter and very dominating inside the ring, WWE could create a star that would outsell him if they would only try!
For example, what about Superstars like Finn Balor, Baron Corbin, Seth Rollins and several other stars that could thrive in the top role? They also have a plethora of other stars like Dean Ambrose, Roman Reigns, AJ Styles, Shinsuke Nakamura and others that could easily be turned into the top guy, but WWE still seem to stick with Lesnar for some reason.
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Maybe it is the realism aspect that he brings, but if that's the case, why not bring in someone like Conor McGregor for half the money that Lesnar earns and allow that to be their big draw. They would still have the realism and they would pay a lot less money because of McGregor not being an established star in the WWE.
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