What easyheat said. I came through the era when the notion of a pilot shortage was inconceivable, equally inconceivable was the notion that kids would be trained at dedicated schools in 12 months then thrown straight into the right hand seat of a 777 for few years before sliding across to the command seat. That's how airlines do it these days and into the future.
Domestic short haul should see a return to 50% of what it previously was within a year I would think, Long Haul a few years. Anyone much over age 55 isn't going back, Whilst there won't be a shortage, there probably won't be an over supply either.