I think a national senority list is a wonderful idea and much needed.
However what happens to a pilot with Airline A for 10 years and Airline B closes their doors and their pilots get on with Airline A. Should those new pilots jump ahead of the 10 year Airline A pilot if they have more time in national senority.
Should pilots be allowed to leap frog over pilots at a new airline over pilots who have been with that airline for years, perhaps since the start of that airline?
Just some thoughts, although I think some form of a national senority is great. Nobody should have to relive 1st year FO pay more than twice.