I am still trying to figure out why a player who pays an agent more than most people in the country make in a years salary needs a union. Why should they be able to negotiate individually and then again as a union? To mix metaphors, deal or get off the pot!
Having lived through the 60's and seen that players had to get jobs as regular people in the off season because they got paid so little while owners were making gigantic money, do you really have to ask this TB?
Without a union I could see owners purposely blackballing players, conspiring on keeping player salaries within a much lower scale than they currently are, looking to only offer incentive laden and non-guaranteed contracts, and other things that would make the owners much, much richer and the players much poorer.
While I think some unions have outlived their purposes, and maybe sporting athlete's unions are some of them, I could also see were sports owners would do everything they could to take advantage of athletes if they could.