Just out of interest, stj, how would you have ended it?
Like I said, i'm self aware enough to realise I'm taking a very pragmatic stance over the decision not to release the tapes, but frankly I think certain people are being equally naive about the same decision, as if reducing the world to death filled anarchy is somehow ok because it's the moral thing to do?
Having Jack release the taps would indeed have taken the show in an equally dark direction. Mass uprisings/revolutions are not pretty, to understate dramatically. The point is, the producers and writers are not capable of accepting the darkness of revolutionary violence. They can accept the darkness of an absurd scenario where someone just has to be ruthless to save us all. I suppose in the end it's just accepting that "we" are an empire, and empires have to what it takes to win. And the type of entertainment appropriate to an empire has Children of Earth, whereas Captain Jack Harnkness trying to start an uprising isn't appropriate entertainment for empires.
I would have ended it with Jack releasing the tapes. Lois Habiba "commits suicide" in her jail cell. Gwen and Reece and Jack try to coordinate not just resistance to the roundup of children but organize an attack on Thames House. The governments of the word fail to get the majority of the children to the rendezvous points, but the 456 take the ones they can and leave. The governments manage to suppress the rebellions and arrest what's left of Torchwood. Bridget Spears manages to forge an order sending Torchwood to a different location and they escape. She's caught and "dies of a heart attack." The series ends with the old Torchwood hiding in an abandoned school in a poor neighborhood, watching TV news about the resumption of school, with shots of the wealthier neighborhoods looking perfectly normal.