Liam Neeson
Who He Would Play: Uh, this one is a no brain brainer, he would play the father of Statham and he would be seeking vengeance on the crew that killed his sons. His particular set of skills versus the set of skills of the Fast Gang. Yes please.
Why He Would Do It: Once considered a serious actor, he know almost exclusively appears in mindless action thrillers, where I'm sure he collects a sizable paycheck. And with the Fast & Furious franchise printing money still, there is no monetary reason they wouldn't pay him.
Mark Wahlberg
Who He Would Play - A maniac Boston cop who Paul Walker used to bust bad guys with. No Walker has no choice but to take him down... In recent years Wahlberg has proven himself to be an ass-kicker, but no role has exceeded his Officer Dignam from "The Departed." Picture that character...as a bad guy.
Why He Would Do It - With star turns in "Contraband," "Ted," and the upcoming "2 Guns" Wahlberg has become something of Universal's Go-To tough guy, so it would be easy to slot him to their top of the line action franchise. Besides he took the lead in the new "Transformers" so he clearly has no problem jumping into franchises at any point.
Eva Mendes
Who She'd Play: Even though she appeared in the tail end of "Fast Five" Mendes' cop character Monica Fuentes was nowhere to be seen in "Fast Six." I could see her coming back in some disgraced cop seeking vengeance against Hobbs role. It would tie the story together oh so nicely.
Why She'd Do It: What reason would she have to pass up a chance to be the main villain in this franchise? Seriously?
Halle Berry
Who She'd Play: Some type of international criminal who the gang have to take down. I've always wanted the franchise tackle more exotic locations (Southeast Asia, Africa, The Rings of Saturn) so with her exotic looks, I think she could fit right in.
Why She'd Do It: Berry's name recognition is pretty strong with audiences, yet her choices in movies have been weak at best. A big role in the franchise could revitalize her career and position as kind of the female Liam Neeson - a slightly older ass kicker.
Martin Lawrence
Who He'd Play: A very dangerous and powerful LA drug kingpin with connections to everyone. Sooner or later the franchise is going to have to return home to the streets of LA and I could see Lawrence ripping it up as hilarious but totally evil bad guy. Besides you know any scenes he had with Tyrese & Ludacris would be hilarious, that duo has been bringing the laughs for the last three films!
Why He'd Do It: I like to think a chance to play a bad guy would interest him.
Honorable Mentions: There are many big time actors just jump into the ultimate summer popcorn franchise, but I doubt they'd do it. This list includes Leonardo DiCaprio, Denzel Washington, Daniel Day Lewis (yes seriously, pure intensity), Robert Downey Jr., Gary Oldman, and Alan Rickman all come to mind.
What About?: Ahh, I knew you'd ask. As much as I love them Arnold, Stallone, Van Damme, and even Willis are just too old/dated to fit into this franchise. Let's keep them locked into the Expendables purgatory.