“The Americans” should be back in the fold this year, partly thanks to the absence of two of last year’s nominees (“Better Call Saul” and “House of Cards”), but mostly because it delivered a near-perfect final season, an intense, final act clash over ideology, progress and change, laden with recriminations and regret. And that final episode — Paige got off the train! — was an instant classic, both surprising and satisfying. Even the unanswered Renee part. She was a Russian spy, right? Nyet?