Bingo there it is!
And not once in that post does the word pay $$$ come up it's all about being a bloody captain who gives a !!!! why the hell should a guy/girl with experience to do the job ACCEPT that they have to move to the bottom and take a pay cut, who cares if you have DECs or DEF/Os.
I can't believe you're advocating that a decision someone may have made 20+yrs ago is final and if they want a change of lifestyle or a pay rise that they would be swanning in. You act like crew in Australia wouldn't want the opportunity to try overseas after 20yrs in aust?
Not everyone wants what you want, you really want that shiny jet after 10yrs the company will love you how about a pay cut with that? "Yes please"
Without seniority those who want pay can chase it where ever they want.
Without seniority those who want shiny jets can chase it where ever they want.
Without seniority those who want lifestyle can chase it where ever they want.
Without seniority you can chase any of the above where ever they want and whenever they want that's what mobility is all about and is how the rest of the world operates.