Very optimistic for you to believe that politically entrenched unions in major US cities will allow this
Buyouts for the affected bus drivers.
For historical reference, this is how longshoremen/dockworkers were compensated when shipping containers increased efficiency.
https://news.ycombinator.com/item?id=30856522 (citations)
That was a very fun sub thread to read, both for the on-topic and off-topic discussion. Thanks for sharing.