I dunno man, I think they do it more to prove a point than to "destroy" anything. Big Tone keeps calling himself the "challenger brand", and I think WWE will take every opportunity to show them "you absolutely are fucking not" and flex. Tony's ego won't let him make the PPV move to Sundays permanent. H/Khan/Ari/whoever else you want to use as the collective "ego" of WWE won't let them lose to a significantly lesser company, because right now that's all AEW has been so far in the grand scheme of the business world.
They don't have the leverage WWE has in media, production, business, advertising, ANYTHING. They have a rich data analyst backed by his father's money, that's literally the only thing they have over WWE, objectively speaking, from the business side (roster, writers, storylines, etc is all super subjective depending on the individual, not talking about that at the moment). They absolutely have the potential to be more, but I don't think Tony will get out of his own way to allow it, IMO.