He doesn't have a strong argument. Perhaps he knows more than he's saying but most of those tasks could be done in advance or by remote (not time critical, like navigating around storms), or by suitably trained flight attendants (medical emergencies and miscellaneous busy work he alludes to).

If 1% of landings are on autopilot, why not all of them? He doesn't answer this except "setting it up is hard". But setup can be done remotely, if not in advance, by someone who's also controlling several other aircraft, so there are efficiency gains.

We have had driverless trains for decades - see London's DLR. The ticket inspectors can ask the passenger sitting at the front to please change seats so they can unlock the control panel and handle abnormal situations.