The last scene between the brothers where both have elected to give up their other relationship to commit to hunt together is really sad rather than uplifting. I don’t know why Sam made Dean pay the price he did, given his past characterization; jealousy seems a very unsatisfactory answer. I don’t know why Sam regards Amelia as his first stone, his chance at happiness, when previous episodes suggested the relationship was more illusion and escape than anything else.
I don’t know why I should be hoping Sam recommits to hunting with Dean, as I don’t feel the connection I used to between them. If Sam really wants that life with Amelia and feels only a sense of duty in rejoining Dean, then I don’t need him with Dean. I’d sooner Sam leave to go find out what life with Amelia would really be like, warts and all, while Dean defines his own brothers. That seems a much better outcome than Sam seeing little value in his life with Dean other than duty and Dean realizing Sam will never define family the way he does, and yet the two of them ending up in that car, driving down the highway. That would truly be sad and not especially compelling to watch.
I’m watching the season to the end no matter what—I’ll give the writers the space to completely write out the story they envisioned this year. But I can see for the first time that I may not watch this series to the end. Sam and Dean are the core of the show for me, and if they don’t work, nothing else matters.