Shared Cache Is Going Away
I always felt like this was mostly a dream anyway due to the diversity of libraries, versions, and CDNs across the web. Everything would have to line up perfectly, within the TTL, to get the performance advantage of loading from cache. And even then it was only really an advantage on the first page load of a site visit; subsequent pageloads would hit cache anyway from the first page.And speaking of privacy... if everyone across the web is loading resources from one CDN, that seems like an interesting stream of data for that CDN.