[arethuza]

Well, they could always start trading with each other - cutting us slow, dim-witted, lumps of meat of the system entirely - Charlie Stross gave a view of that with the Vile Offspring from Accelerando:

Capitalism eats everything then the logic of competition pushes it so far that merely human entities can no longer compete; we're a fat, slow-moving, tasty resource – like the dodo.

http://en.wikipedia.org/wiki/Accelerando

Personally, I'm hoping that in the long term we end up with something like a technologically plausible version of something like the Culture (i.e. the Culture's combination of AI and biologicals existing in harmony), or at least the ending of Elysium.