The final season starts March 28. To me, the son is the key. He is clueless, but is showing signs of self-sufficiency. They don't want to take him back to Moscow. I think Paige continues down the spy path, setting up a spinoff series as she completes college and gets a job with the CIA. Phillip and Elizabeth can't defect because that would blow it for Paige. Beeman's girlfriend is a graduate of the Sparrow school and compromises him. Maybe Phillip and Elizabeth fake their deaths and set up new lives (and disguises) in Columbus - Elizabeth does like the shoes and Easton is about to develop- anonymous to everyone. Until Paige's spinoff series.