What some people dont realize...
When these majors start hiring with no TPIC req, and all these lowly regional FO's and junior captains leave because its an upgrade after a year or two to them.. what happens to all these top half, senior captains making 100k flying a 50 seater? Sure, the top of of those top half with be safe, but what happens to the rest? Instant downgrade, that is more of a pay cut than if they had gone to the majors hiring a year or two earlier.
So much for secure