Brony, although there’s no longer a reserve clause, for the first few years of a player’s career, he can’t really choose where he wants to play. The draft is still, for some reason, legal.
Maybe in a way it’s not a bad example, though. If there are 1200 ballplayers and only 1000 slots on major league teams, no matter who approaches whom for a tryout, there will still be 200 players without a team.
Also, those players who have had really poor minor league stats, they’re likely to get much fewer tryouts than the ones who had better stats (the dating divide). But having mass tryouts with all players involved will still not leave any fewer than 200 unemployed.