The network told producers yesterday that they are not giving another season to the nuclear attack drama. The show had filmed two endings for the seven episode second season: one a cliffhanger in case the show was renewed for another season, and the other an ending that would serve as an ending to the show and satisfy fans. It's the latter that will air on March 25. While the episode does indeed leave room for a continuation, I think we can say it's really gone for good this time.
I guess this was inevitable. CBS only OK'd seven episodes for the second season, and it was probably going to take enormous ratings for the show to see a third season, and we knew that wasn't going to happen. The ratings for the second season were lower than ratings for the first season. Which is really too bad, since this was a quite a good little drama.
By the way, I'm sure that sending even more nuts to CBS wouldn't have any effect on this decision.