The FAA has ALWAYS been behind the staffing curve. When I was in (26 years) they didn’t hire replacements until you were out the door. That means a 2-4 year lead time to hire and train a replacement. By then, more people quit. It is a burnout job, and when you are setup financially, most choose to go. They need to hire a bubble of trainees, but now I fear there won’t be any controllers left to train them. Sigh.