I'm seeing that more and more people are starting to get ideas that are more and more similar to what I had in mind. Today, I read about someone dreaming up thoughts on using Google Gears to perform OpenID and OAuth. I like the thought pattern.
The success of this web is, of course, controlled by the economy it creates. An a-la-carte business model, like the one provided by Amazon's web services, is a great way to ensure that the bandwidth and data storage necessary for the locally-hosted services to scale.