If the Biden administration doesn’t blink, pilots are going to have to be vaccinated to fly. They don’t currently even have to wear masks in the cockpit.
While many unvaccinated pilots will get jabbed, and union senior rules mean that the more senior the pilot the harder it is for them to just leave and go fly for someone else, the concern is that the most senior pilots will take retirement. That will also have a cascading effect requiring pilots to get retrained on different equipment, also as a result of union rules.