Market share data courtesy of yipitdata.com.

There are others, but Waymo in the US and Badiu's Apollo Go in China, now seem ready for take-off with robo-taxis. From now on the only constraints to growth will be how quick they can deploy new vehicles to new markets. When this explosive growth is finished, there will be tens of millions of robo-taxis in every town and city on planet Earth.

The real revolution will be the global displacement of tens, perhaps hundreds, of millions of human driver jobs. We are rushing headlong into this future without anyone preparing for it, yet it's going to happen whether people like it or not, and it's heading straight for us.