#2 Roster problems

WWE still has and will continue to have some roster problems until things shake out and some superstars are able to return to injury, but until then, WWE has to rely on who they have to fill the role. Unfortunately for The WWE Universe, one of the people available is Brock Lesnar, which means that he will most certainly continue to be a part of the title picture.
The WWE Universe should see this as a good thing. Lesnar is a great place holder until another champion is able to rise up to the challenge once again. Of course this doesn't mean Lesnar needs to win the title, but having him in the title fight gives WWE a level of legitimacy it wouldn't have otherwise.
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Think about it this way, with Undertaker, Goldberg, John Cena and Triple H on part time schedules, the loss of Dean Ambrose and possibly Sasha Banks, plus the injuries that many superstars are dealing with, Brock Lesnar is WWE's only option for now. Beyond that, he is their best option to keep things on track for the time being.