I think it's cool that they have it all one page of HTML but this is quite different. Rather than a single doc, or even something you might call one protocol, this is a collection of optional specifications. Nobody can know which will find a place in the market of apps and use cases but my hope is that providing a straightforward way to publish and version these things, with machine readable schemas from the start, will unleash a lot of new functionality. There are tons of ideas that just need a little support to get off the ground.