I find it interesting that no one has considered this in terms of the adoption of stream-based social tools, where the use of URLs is increasingly not about navigation, but of fetching. Instead of clicking on a URL to a photo in my twitter stream, my Twitter client pulls the photo and resolves it in the context of my streaming application.
One of the principles of the web of flow is the fragmentation of older, page-based media into easily streamable bits. And for that to work, each fragment has to have a unique ID, which is exactly what deep links are all about.
Holy Moses this is smart.