Well, it depends on how much money can be generated. All In, overall, was pretty fun but it was a glorified house show that has no real lasting effects except Cody as NWA World Champion. One reason why All In worked is because of the novelty of all these indy guys getting together and putting on a super show styled house show and it took a lot of time to ultimately get everything set up. Cody and the Bucks didn't just sit down one afternoon and lay everything down, it took quite a bit longer than that. They decided to do it in May of last year, didn't announce that they'd found a venue until after the first of 2018 and revealed the show would be on September 1st. They hyped the show at every opportunity to the point that by the time the tickets went on sale, a good year after they decided they were going to run the show. I could see All In possibly becoming an annual thing, maybe bi-annual but anything more than that I think is pushing it right now. All the competitors from All In are under contract to different promotions and/or they had to get permission to work the show and it's possible that part of the deal was that all these other companies might each get a little piece of the pie, AKA the gate, in order to agree.
The NWA brand is essentially dead when you get right down to it. All the title really has is the glories of a bygone era, but that's not necessarily a bad thing or a good thing, it's just there. Cody is one of the hottest non-WWE wrestlers in the world right now, so having him carry the belt for a while is only going to do some good for it and, generally speaking, I think that's probably the most that Corgan can realistically hope for right now. In many ways, Corgan is simply a fan who has a lot of money and though it'd be fun to get into the wrestling business but he doesn't have the money or connections to relaunch the NWA into some sort of national competitor once again. I'm sure that he knows that so maybe this whole thing could lead to some sort of partnership with ROH and New Japan that might lead to renewed interest. If something ever comes about with the NWA, it's probably going to be years in the making with the result being a syndicated TV deal much like ROH has; Corgan is going to need investors and significant names in order to even get the attention of networks to get a syndicated deal because the big networks aren't gonna be calling with billion dollar TV deals anytime soon.