It was an intersting plot device, with the time dilation field, to allow Carter and Jackson sufficient time to decifer the gifts from the Asgard, and for the crew to work out their relationships. It was an interesting way to progress the show relationships further without having another season. But, 50 years, wow!
So, the Asgard are gone, or at least going. I was very dissapointed in their ending. It was too short…they deserved more.