Shameless

There was a time when this was an edgy comedy, but over time it just became an excuse to show degeneracy, The series natural end was when Frank beat the odds and celebrated his victory on the frozen lake. After that they were simply making more episodes for the paycheck, after the 9 lives run out and the character still keeps beating the odds, it just becomes a cartoon. Same goes with the Fiona's love life, when such story lines are dragged on long enough, the female lead becomes fickle, indecisive and irrational simply to ensure another seasons paycheck, and the character naturally becomes unlikeable and insane. Notable examples, Sex and the City, and even the Gilmore Girls.