This would imply that Uber/Lyft drivers on average are losing money by being on the service, which is obviously not the case. Having a large fleet of driverless taxis, even if you have to maintain them yourself, will be a very profitable business. There are other potential revenue sources as well, like licensing the tech to car manufacturers.
This is a strong claim. I thought there was a decent body of evidence that suggested most drivers make much less money than they think, when you take depreciation/repairs/etc. into account?