Oh, would they really. Well guess what, he already did. WWE Films have co-produced The Rundown and Walking Tall, and I could have sworn that they have produced Scorpion King as well, but Wikipedia disagrees with me.
WWE didn't co-produce, Vince's name is on the movie so the Rock could be called the Rock. Vince gets a producer credit, the Rock can be called the Rock. That's all it was. WWE films didn't exist at the times those two movies were made. WWE Films would have to take off in a HUGE way for Dwayne to come back to star in one of their films.
Actually, both "The Rundown" and "Walking Tall" were produced in association with WWE Films. So there you go.