I love Dean and Ben, and I love the father-son relationship that they built. That's why I need to say that I stayed very sad and disappointed door the way it ends, Dean suffered so much in his life and when he finaly gets the chance to have a real family everything is taken away from him, piece door piece since the beginning of the season, and now looks like everything ended definitely!
But, as the fan I'm, I still have hope because I honestly don't belive that some angel magic could erase the great father and husband that Dean was, especially for Ben that spent half of his childhood not knowing how was like to have a father, but then he gained the best father he could ever ask for and these things can not be taken away from someone's life! I belive that he will, some how, remember of the father that he once loved and who loves him back.

We should always remember, with Supernatural we should belive in the impossible.

Fingers crossed.