The Rock had such awesome, natural charisma, to go along with a massive, action movie hero look(keep in mind, since he left WWE full-time in 2002, he's had liposuction on his pecks, has dropped a good 30 pounds, if not more and is utterly shredded).
Jones is an amazing athlete, and good on him if he can make buckets of money without damaging his body, but he doesn't have a transcendent look or outstanding personality that would be able to really pop in the Hollywood state of mind. The Rock is an anomaly, massive wrestlers like Hogan, Austin and Piper have taken SERIOUS runs at Hollywood and just didn't have all the pieces in place to be a true A-lister and had to settle for mainly direct-to-video fare.
MY MMA RANKINGS
HW Cain JDS Werdum Cormier Barnett Bigfoot Browne Miocic Napao
LHW Jones Goose Evans Texeira Davis Hendo Shogun Manuwa
MW Weidman ASilva Belfort Jacare Machida Rockhold Munoz Kennedy Bisping
WW GSP Hendricks Condit Lawler Maia Kampmann Rory Ellenberger Askren Lombard
LW Pettis Bendo Alvarez Chandler Grant Gil Thomson Diaz J.Miller dos Anjos
FW Aldo Mendes Lamas Frankie Cub Lentz Kawajiri Zombie Elkins
BW Barao Cruz Faber Bibiano McDonald Moraes Assuncao Wineland Dillashaw