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 ...