[rwallace]

> The fraction of things that humans can do which machines cannot is shrinking monotonically.

That's only true until it's not. Our little enclave of civilization that currently exists on this planet has a finite lifespan, just like every other civilization that's ever been run by uplifted killer apes. Either we will achieve a takeoff point within that lifespan, or we will not. If not - and I think that's the more likely outcome - there is no reason to expect another industrial revolution now that the easily accessible fossil fuels are all gone. Our descendants will eke out a living as subsistence farmers until evolution eliminates the overhead of general intelligence or the sun autoclaves the biosphere.