The West Wing – (1999-2006)
Aired on NBC, The West Wing is considered to be one of the greatest television shows of all time, but that didn’t stop it from collapsing on itself. The creator of the show, Aaron Sorkin, was involved in almost every script from the show’s inception until Season 4, which shook things up when he left.
Sorkin, as well as the executive producer Thomas Schlamme quit right before the fifth season unexpectedly due to concerns about the show’s budget. After the two left, the show had almost no chance of survival.