Thing is that WWE will only ever work with a company for their benefit. Indy promotions like ICW, Progress and formerly EVOLVE gained some exposure from the working relationship with WWE and in return, WWE was able to grow their own NXT UK or NXT brand by both taking talent and letting talent work their shows. NJPW, AEW and Impact are all too big for WWE to work together: They see them as too much of a threat and don't want them to benefit in any way, shape or form. I know there was news once of WWE approaching AJPW in regards to starting up NXT Japan but who knows where that went.Yeah, that's probably never going to happen ever again. Only possible way it might happen is during the HHH reign, but WWE wants to thoroughly distance itself from any other promotion.