The Rock is not an active wrestler in WWE. He is a Hollywood star and due to that, he simply cannot give time to wrestling.
Triple H spoke with Alex McCarthy, where he revealed the reason why his match against The Rock did not end up happening. They were in talks and even taped an angle. However, Dwayne Johnson’s busy Hollywood schedule did not allow the match to take place.
“I don’t remember the details of it, but it was one of those things that Rock and I talked about to the point where we did the backstage promo. ‘Let’s throw a scene out there and see what happens.’ It blew up, so we talked about it some more. Then scheduling just got in the way,” Triple H said. “At that point, we were over a year away from that WrestleMania. It wasn’t until, maybe four months of the following year, we got to that, and Rock goes, ‘it’s just not gonna work. I just can’t. All of my stuff. My movies and everything has changed. I just can’t make it work anymore.’”
“It was what it was. I would’ve loved to have [done] it. It would’ve been a blast to step in there with him one more time and tear it up.”
It is doubtful that The Rock will be able to give time to the company and so his time in WWE will likely be single appearances.
h/t to Wrestling Inc for the transcription.