And as they do, something profound will happen. As Erik Brynjolfsson and Andrew McAfee highlight in their new work The Second Machine Age, automation has allowed workers to do more for less. But pay hasn't kept up, resulting in a "decoupling of productivity from employment" - of wealth from work.
Sure, Sheryl Sandberg, Facebook's chief operating officer, says technological change has helped ordinary people to become billionaires from their bedrooms.
But tech billionaire is not for everyone. I take more comfort from the words of Mark Carney, the Governor of the Bank of England, who says he is "positive" about technological change. He says education is the key to keeping humanity off the scrap heap. Brynjolfsson says the future will not so much be a race against the machine, as a race with it.
Take my own case. Apparently, as a financial journalist, there's an 11 per cent chance I will have been replaced by a robot in two decades. I have a better chance of keeping my job than an air traffic controller, but less chance than a hairdresser.
Editors and comment writers, though, have just a 5 per cent chance of being replaced by robots, compared with 50 per cent for court reporters. Humans are more valuable when they have opinions, it seems. So perhaps you'll still see my name on these pages. That's the thing about old Homo sapiens. We learn to adapt.