Briefly: Once upon a time, an action star was enough to make a huge audience want to see a broad array of films. That model is changed now, as audiences follow concepts and franchises more than stars. So
Vin Diesel is the new sort of action star, where he can help propel the
Fast and the Furious franchise to billion-dollar status. But the
Riddick films? Not so much. So for an encore to the last two F/F movies, Vin Diesel seems to be ...