Smallville creators/executive producers Alfred Gough and Miles Millar are leaving the young-Superman drama after seven seasons, though the CW will keep its longest-running and highest-rated drama on its viewership-challenged schedule next year. “We look back at 152 episodes,” Gough and Millar wrote in an open letter sent to media outlets this morning. “We look back knowing that the show will continue into season 8 without us. After much heartache and debate we have decided it is time for us to move on.” Here’s to hoping it goes better than the net’s Amy Sherman-Palladino-less final season of Gilmore Girls.