If asked to name successful film franchises, you could more than likely rattle off a few that have held audience interests long enough to exceed the standard trilogy. James Bond. Harry Potter. Star Wars. Heck, even Resident Evil is still putting bums on seats after four instalments. But not all film franchises continue to pull in the crowds, instead defaulting to DVD as they continue to explore their characters, story and that crack in the floor in HMV. We’ve found seven of the saddest…