Something I'd like to see happen is Universal pulling the trigger on the second and third installments of the trilogy David Twohy and Vin Diesel had in mind when they made Chronicles of Riddick back in 2004. Yes, they did pull off another film with their own money a couple years ago (Universal just happened to end up being the U.S. distributor), but that was more of a smaller side-story. The ending of the director's cut pretty clearly sets up the premise for part 2, which they always said would be The Underverse.

Vin Diesel said something about having talked with the people in charge at the studio, and that they'd said it was still a possibility. Obviously the box office failure of Chronicles wouldn't inspire much confidence in signing more checks, but IIRC it was the dvd sales that eventually led to another film being made. Maybe they can make it happen if they keep the budget just low enough.