WWE isn't cool anymore so the normies will eventually stop watching as time passes. That being said, they won't go to AEW because that's not cool either (wrestling in general isn't). I can see AEW staying at these numbers while WWE keeps falling.
People who actively watch AEW have at least a couple brain cells to rub together because they were willing to try something other than the most mainstream, generic option in WWE. And that is actually somewhat impressive in today's low bar for media consumption. There's literally no reason to watch AEW other than liking the product but the same can't be said for the fed.