Not really Pidge.
Under the muppets we had a lot of short term loanees who didn't seem interested whilst we weren't bringing on much of our own.
There were notable exceptions Lang , Surridge, Bryne, Iverson, Palmer etc and the best of them probably raised the game of those around them
I agree that if we brought a couple in there might not be anybody missing out now but I think it has been an issue in the past.
I agree it works well for the higher clubs and your point about them hoarding players who then drop out is valid too. On greedy league budgets it is relatively cheap to keep a teenager on what for most people would be an incredible salary on the off chance a few of them make it or can be sold on for millions.
I'm not sure how one would legislate for it but some element of 'use them or release them' with some sort of cap on overall numbers might release a few more nearly men whilst they are still hungry.