@K9 The drafting of new players unfortunetly means the release of others.
Does your son have an agent to discuss options? Son was released by his drafting team then walked away on his own after two seasons with another ML team, played independent ball for the Long Island Ducks then headed to Mexico for a season. His time was running out to go back to collect his MLB scholarship $$ and finish his degree, getting older and on the advice of his surgeon he did just that. He had enough with the nagging injuries.
Coaching college baseball going on 7 years, I can tell you that he never regretted his decision to walk away from playing and he loves what he does and we see a passion that he did not have when he was a player.
I know how you feel, I know how he feels. It stinks. But whatever the end result, he will be fine, you will be fine.
Wishing him all the best of luck.
TPM