The problem with streaming is too much vertical integration. The studios own the content, the streaming channels, the cable channels, the broadcast channels, the set top boxes, and even the internet connection. It’s strangling competition, and preventing content from being shopped around.
Studios would rather take the content off the air for a tax write off than let their competition have it. And the content creators have little to no access to information about how successful a show actually is, making it difficult to sell (if the studio allows it at all). In many ways it’s similar to when the movie studios owned the movie theaters.