#2 The quality of SmackDown has declined considerably

It's indisputable that in the post-Attitude Era, WWE is a cyclical business. September to January are WWE's winter months. Even with AJ Styles at the helm last year, this didn't change. And yet, most of Jinder's reign came outside of those months, where average live attendance has continued to decline. SmackDown, in particular, has become notorious for low attendances this year, infamously only drawing 4,000 in Las Vegas with Vince McMahon in attendance.
And even though last week was Halloween and also featured a World Series game, the low SmackDown rating seemed to spook Vince enough to want to make a drastic change.
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Ever since the Superstar Shakeup, SmackDown has been a mess with only a few bright spots. Jinder Mahal isn't entirely responsible for that, but he's been a big part of it. If the main event is poor, the rest of the show loses a major chunk of its appeal.
If SmackDown wants to retool for next year and become a better show, starting the change at the top of the card is a good idea, which brings us to the last point.