I thought the announcement by Triple H that WWE was "open for business" with respect to other feds was highly disingenuous. IF AEW and Impact had not just surprised everyone with their alliance, WWE would NEVER consider aligning themselves with other feds because they believe doing so would benefit the other fed much more than WWE. As a matter of fact, I STILL think Vince would overrule Triple H if he tried to form an alliance with another fed (unless it was on terms highly favorable to WWE and incidentally benefits the other fed). Vince wants to dominate, not cooperate.
On the other hand, that's what made Vince a billionaire and got WWE where it is today.