The guy is making multi-millions in Hollywood. I don't think he's tempted enough to take a HUGE pay cut, put his body through hell, go on the road for 300 days a year, and be away from his family.
The Rock's $5.5 million salary for The Scorpion King has been registered in the Guinness Book Of Records as the highest amount paid to an actor for their first starring role
Salary for "The Rundown": 12.5 million
Salary for "Walking Tall": 14.5 million
Salary for "Doom": 5.5 million
I don't see the Rock walking away from those numbers. The Rock, I doubt will ever return full time, but has stated that he will come back to work a program with someone "if it makes sense".