I don't know. That was just a guess as to what will happen. I know there will be changes, but don't know what will happen. I think it starts with differentiating business and resi customers. This is US focused.
In the scenario I posted or something similar, it would probably start with slowed hiring. This is tricky because you need to staff for current volume and service while knowing the need will decrease.
Overall staffing would be less. This would probably be done through attrition. Turnover is highest among newer employees, so some wouldn't be replaced.
With fewer packages and higher automation, the hubs would require fewer employees and hopefully finish quicker. There is also the possibility that stations start the sort a little later if processing less freight. Service for FO and PO would need to be outstanding.
PM routes would remain similar to their current state for pickup reliability. Some reduction in outbound volume would be expected, especially for bulk 2D and XS shippers.
FXG, I have no idea except probably very busy. I would be curious about on call pickups how they would be handled. Customer service # is bad anyway, but in this scenario how would one decide the service required? Better trained CS reps? Push more people online and let the software determine the service and if it's FXE or FXG?
This is just guessing too though.