Well, today there are thousands of pilots with experience, who made their last flight within the last 12 months, and possibly with valid licenses. But the pilot's career is perishable.
So, 2 questions: what will happen in the future (let's say, from 2022 onwards) when the economy has hypothetically improved, there's a new positive cycle in the aviation industry, airlines start hiring again, and of course, there's a pool, although with a bunch of experienced pilots who made their last commercial flights over 24 months ago and eventually with expired licenses/type rating? Who will potentially take those vacancies in the future?