Well HTTP/2 is awesome ... for web applications where you might not have to interact with third parties (ie Google's usecase and they build it in the first plac

Well HTTP/2 is awesome ... for web applications where you might not have to interact with third parties (ie Google's usecase and they build it in the first place IMHO). When you have a web site this is a totally different story : beside your content and statics, you'll have maps from a CDN, widgets from third parties, ads ... and so on. "changing their site to take advantage of its benefits" is just not realistic for normal website.