Dave Knott writes: Tron 3 won't be coming to a theater near you. Disney had been developing a sequel to Tron:Legacy since the movie, made for $170 million, grossed $400 million worldwide. But now they have chosen not to move forward with a third installment in the sci-fi series, sources say. "Disney has had strong success with its live-action properties recently, including Maleficent and this year's Cinderella, which earned $527.4 million worldwide. But it recently had a stumble with the $180 million live-action film Tomorrowland, which underperformed at the box office this past weekend with a $33 million U.S. debut."