AJ's not going anywhere....and there's nothing to indicate that he's unhappy.
He's wrestling on the biggest stage in the world and is making more money than he ever has in his career. Think about the stuff AJ put up with in TNA for not even half the money. WWE hasn't done anything with AJ approaching the garbage TNA did with him and they're paying him significantly more.
TNA put him in the main event of their flagship PPV more than once. WWE put him in there with the CEO's middle aged son who wasn't good 20 years ago in a throwaway match in the middle of an excruciating 7 hour card.
When he's in NJPW, what is he doing at Wrestle Kingdom? Having epic matches with Shinsuke Nakamura.
When he's in ROH, what is he doing at Final Battle? Main eventing with Jay Lethal.
AJ Styles vs Shane McMahon is worse than ANYTHING that ever happened to him in ROH, TNA, or NJPW.
AJ Styles in TNA:
-First ever Grand Slam Champion, only person to complete the Grand Slam twice
-First ever Triple Crown Champion, only person to complete the Triple Crown more than once, did it FIVE TIMES
-2X TNA World Heavyweight Champion
-3X NWA-TNA World Heavyweight Champion
-6X and inaugural TNA X-Division Champion
-2X TNA World Tag Team Champion
-4X NWA-TNA World Tag Team Champion
-2X TNA Television Champion
-Won every men's title in the promotion at least twice
-Pinned Kurt Angle, Jeff Jarrett (3X), and Bully Ray clean for world titles, including in multiman matches with Raven and Sting
AJ Styles left TNA for one reason: Dixie Carter asked him to take a paycut. That's it. He was treated better than anybody in the history of that promotion. But Dixie's rich daddy cut her off and she ran out of money.
I never said AJ Styles was unhappy in WWE. I said that he has leverage if he ever BECAME unhappy.