It will take at least 20 years to roll this out to a significant portion of the country. Human drivers and delivery personnel are just too hard to replace to do this right now.

The roads need to be remade, signage meant for the robots (electronic or visible), and some time to overcome inertia.

It's probably easy to replace the rail to storehouse tracks with automation, but the last mile, especially in small towns, old areas of large towns, and in areas that require subtle navigation, will need a human. I think an intermediary with a drone style central navigation will be needed for many years.

In the meantime, we have a dire shortage of drivers. This could reduce the inflationary pressure of the cost associated with that shortage.