I've never seen this problem better solved in a web framework than in some combination of libraries. I'm sure it can be done and I welcome people who want to do it, all I'm saying is that I couldn't justify the ROI on it myself. On our projects, we get 90% of the way there by using a server-side REST library coupled with a small Javascript library on the client to handle the common paths.

Anywho, cynics are useful- they make us reconsider the value proposition we are putting forward. However, an idea shouldn't be discarded just because a cynic addressed it :)