This may not be far off the mark. You can't go single pilot until the automation can *reliably* handle the 6-8 pilot incapacitations which occur in the US each year. That means full-auto needs to be ready for prime-time before you go single pilot on pax airliners.

But there will be a single pilot during the transition, that will last some number of years until they demonstrate the reliability of the automation. My guess is a few years to find some bugs, then twenty more to rinse, wash, repeat a few times. It will end up taking decades longer than anticipated, and somebody will likely go bankrupt (or get bailed out by the government, either or).