So? If a J* FO moves to VA as an FO because the pay is better, the prevalence of 'top guys' is irrelevant.
More likely the outcome is that a J* FO would move to take a VA command, and VV. No one is going to move for a slightly better package and go through a few months of no pay, re-training in company procedures and line training. Which the savy companies will put you on lower wages for your initial jump anyway, but you will be on more than your FO salary. That's where your argument falls down. This will result in lower wages for captains overall.
Then you have issues such as how to organise baseings, leave allocation and so on. Good luck sorting those issues out without seniority.
Nothing you have put forward at all makes any argument against seniority. It just confirms you have never worked in a large company where you have been trapped in the lower echelons due to cronyism. Which I have seen directly in GA and in Airlines. Seniority ensures the good and the bad get a go all equally, if they don't measure up they don't progress. Get rid of the ticket system and the airline dictates who progresses and who doesn't, we know where that ends regard to conditions.
So whats next mate, going to picket flying schools and abuse every 19 year old who walks in for risking your 300k pay packet? I do hope in the cruise you turn to your young FO and explain to them how disgusting you believe their self entitlement is, that they're sitting here living their dream instead giving the whole thing up to dig a hole somewhere so that you can buy a second boat. You poor bugger, you probably haven't even cracked 2 million in super yet either.
If I'm a Captain on $300k the FO is probably on $200k, so whats the issue? He's probably unmarried, no kids, has 2 boats a racehorse and a pub.
As for picketing schools, no that's stupid, its still choice if you want pilot qualifications, but the truth needs to be told to those training what the early part of the industry is like. Although in the Maritime world there are limited spaces to train and you need some form of recommendation to start off, Australian based shipping Captains are paid more than airline Captains as a result. Mate was recently paid $100k to ferry a tug to Singapore, couple of weeks work, back to early retirement.