Forgive my ignorance (I haven't found a resource that clearly discusses blockchain without conflating it with cryptocurrencies) - but can we even have a blockchain-based tech that doesn't burn enormous amounts of electricity just to operate? If not, then I don't see how blockchain can do anything but make things worse.

Also, the real problem isn't technical here. P2P file sharing technologies - from BitTorrent to IPFS - work well and efficiently. The problem, which makes the Internet media evolve towards big players owning CDNs and not towards IPFS-like network, is legal liability. When I watch a video of a wrong colour on YouTube, I'm protected by Safe Harbour. If I watch the same movie over BitTorrent, I risk having my life ruined by copyright laws. As long as this can happen, we won't have fully decentralized media.