#1. Chris Jericho's mainstream appeal
While Chris Jericho may not be in the same status as The Rock when it comes to Hollywood, he's still a well known name that garners mainstream appeal. Jericho will be starring in the Jay and Silent Bob Reboot as a villain. The larger point is that this gets eyes on the product in any shape or form.
It's clear that Jericho was going to be the face of AEW. Tony Khan was smart enough to realize that putting the AEW Championship on Jericho was an effective way to build other stars. Jericho is a known entity and as a heel surrounded by a group of thugs, he's set to hold on to that belt for a long time.
It's clear that Jericho believes he was a main-event star, despite having been missing from WWE's main event scene for years. Jericho's AEW run is important for the whole promotion and he has been tasked with getting this new talent over, whether in promos or in matches.
Whenever Jericho actually retires, he will have left a body of work that will be marveled at for years to come. Hopefully, that will include making AEW a promotion that will last for a long time to come.