My take on Series 4. Obviously bending the reality of reality a bit. :]
I'll be putting in cameos of past companions of the Doctor.
What left the Earth was humanity. Not just the humanity of one man, but the humanity of others. The rationality of mankind. It was the Cold War all over again but even deadlier. It was small at first, just sudden thoughts here and there. But the people spoke and the tension spread throughout the planet. Wars that were already going on frightened the people. One wrong move sent others into paranoia.
And Britain. Britain was at the heart of it.
In a small flat in a little kitchen, a woman puts the kettle on for her husband and her young baby girl who is barely three. In another flat another woman puts the kettle on all alone. Somewhere else, a secretary suddenly jumps as she sees someone enter the office that looks strikingly familiar, but it isn't him. A gun clatters to the ground as she empties it at a practice target. She hasn't touched a gun in three years. She remembers the last time she used it, a shot in a man's leg, and before that, to kill. In a small attic, a woman and three teenagers pace the floor –or ceiling. The world seems a lot smaller, even with their super computer.
Over one ocean, on the coast, in a high rise building, once-were British citizens and now American are asking too many questions. The general dismisses them, even threatening to fire the woman, but he doesn't really mean it.
But they're all wondering what the world has come to.
And dotted across the world, are those who still believe there are blue police boxes. Others have already lost hope. No blue police box was ever going to come. Because if he didn't already, he never would.
So basically, handing kids over was blamed on Torchwood.
Cold War tension all over again, with less people aiming nukes at each other.
Probably get less confusing as it continues.