There's calls for easier schedules, but as they say, the show must go on. You can't cancel a sold out arena if your lead person isn't feeling well, just like you wouldn't cancel a football game if the quarterback is sick.
(I'm not defending some of the treatment of wrestlers by their employers nor am I excusing their issues - I'm just asking do we know where these problems stem from? Seems easy to blame the boss, but is it their fault?)