NWA and nostalgia marketing
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Speaking of the NWA, before the juggernaut that was WWE. A coalition of territories controlled the business of wrestling under the umbrella of the National Wrestling Alliance. Its champion would tour each territory and promotion, competing against the talents of a local area and building the business of professional wrestling.
WWE's rise changed the game, bringing forth on corporate giant at the center of a booming and then floundering business. While that NWA may never really come back, fragments of it can still be found within the Indie scene.
In fact, the revival under Corgan with a touring champion like Cody is the first step to bringing the disparate promotions to battle WWE's global takeover. ALL IN set an intriguing precedent for this, bringing promotion branded stalwarts into one big event.
It also rode on the idea of Cody and his father's legacy as a former NWA champion. The event itself played on the form of classic NWA promotion cards. This form is known as nostalgia marketing, a lucrative technique used on a generation full of love for the retro.
It is also what has made ALL IN such a success, the glorious past feeding the success of present-day for a shining future.