It would be interesting to know how many reservists they have today, and I'm not talking FEMA Corps staff, who are younger with little to no technical experience. FEMA has tried to fill the gap with them, but that is a risky proposition when getting into technical details that you run into with disaster recovery.
If you say that the 9,000 number is still valid, and you have 100,000 homes damaged from Hurricane Harvey in Texas alone, and then even more properties being added with Irma, plus you need to cover the public agencies and damage to infrastructure, I think you run out of people really, really fast.
If Hurricane Jose, a Catagory 4 storm, hits the mainland--and different areas of our coastal nation--yikes!