If we assume navigating a city is the harder part of trucking (and I believe that, I've seen some crazy trucking maneuvers on city streets), and that truckers of the future are going to be largely navigating the city over and over, then we are quickly going to see which truckers can do that well without problems. The number of truckers available on the market will increase, but the job will be fundamentally different in the composition of skills required. It's possible that those that can quickly and reliably navigate city roads without problem will rise to the top and be able to command higher wages. It's not guaranteed and it wouldn't be immediate, but I'm not sure it's unlikely.