Even in the age of “peak TV,” when there are hours on end of noteworthy television every night of the week (and twice on Sundays), there is a particular, once-thriving subgenre that’s become increasingly hard to find: The old-fashioned primetime soap opera. I’m not talking about the shows of the Shondaland variety that are so exaggerated as to be a kind of postmodern melodrama. Nor am I talking about self-aware, high-concept shows like Jane the Virgin. Those series are great and people love them, as they should. But the classical middle ground is quickly disappearing. With the critically acclaimed Parenthood off the air and the still-breathing Mistresses taking up Summer airtime, the recent cancellation of ABC’s Nashville signaled another major move toward dormancy for the traditional evening soap.