Well, the end of the 1930's to 1950's vertical monopoly shouldn't detract from the many ways the entertainment industry is monopolistic today. Indeed, my impression is no one could even summarize all the ways unions, rights, contracts and etc divide profits, limit who can do what, etc.

My impression buying a historical piece of the entertainment industries is a lot like buying a company with large patent portfolio. No one knows whether the buyer is going to use the pieces "offensively" to cut off the rights of others or "defensively", to get leverage for cross licenses and so-forth.