I'm not sure if we've seen this entirely play out yet. We're now seeing content companies (supply) starting to exert their power over the internet/media intermediaries (Disney is the recent example), so it may end up being a case that the intermediaries had a good thing going for a while, but...

IMO, you either produce something or you don't. Someone may be able to interject themselves into your transactions with your customers, but, ultimately, the power lies with the producer (they can just stop producing).