I always considered my favourite system to be one where the discovery system was centralized, but the actual content itself and the ability to produce it was decentralized. So, for instance, you'd have "PeerTube" as a protocol for uploading your videos to be discovered, then you'd use something like "Youtube" to view videos from multiple peers. This prevents a massive amount of lockin as happens with the current services, but also enables all the QoS you expect from modern websites.