It's not that revolutionary anymore... Twitter has been doing it for quite a while now, and see http://news.ycombinator.com/item?id=3236820 for more discussion.
Personally, I've rewritten a bunch of code at work to go from server-side rendered templates (in Jinja) to client-side rendered templates (using a Jinja-to-JavaScript compiler I wrote, https://bitbucket.org/djc/jasinja). Add some WebSockets magic and we now have a very fluid real-time application page.
The model is obviously very powerful. The one problem I have with it is JavaScript-the-language. Using it makes me love Python so much... I know it's not that bad and there are good parts, but it's still nowhere near Python.