Iron Fist
Some are saying that Scott Adkins should play Batman in a reboot series, but I think that would be a waste of his martial arts talent.
With the new Marvel Studios established, I think Scott would be better served playing Iron Fist. He could have a dark, origin, solo movie to compliment the same set-up of Power Man (Luke Cage). If they both succeed, then launch Power Man and Iron Fist! If only Iron Fist succeeds, then run with that.
Other than that, if there is no Iron Fist, Scott is perfect to play Moon Knight for Marvel.