[tempsolution]

> Anything that can be neatly siphoned off from that more complex imperative world, should be.

No it really shouldn't. Just look at JS. It's a complete mess. And HTML would get there in a short time if they were to adopt "anything that can be neatly siphoned". The problem is that data binding is actually quite complex. I have seen data binding done 10 different ways in different languages and they all had their flaws. It will be very difficult indeed to come up with such a standard that is actually being used universally.

If it is not, what sense does it make to add it to the standard? But for it to be used a lot, it would actually need to solve most problems in most businesses for the forseeable future.

Given the fact that the Web apparently still hasn't figured out quite how UI development is supposed to work (judging by the 1 new language feature, 10 new frameworks, 100 new libraries developed each day), it will be a very poor idea to start baking half baked stuff into a standard.