That just sounds like a passive-aggressive arbitrary rule change. For about 99% of the world the curability, or not, of the web doesn't matter at all.

We already have a perfectly good web and includes things that are not curable, even if we exclude javascript (trivial example: you can't, meaningfully, curl a live sport event).

What do you mean, can't curl a live sport event? Do you mean you can't save it to disk (PVR), or if it's not audio/video, it's not useful to curl it and parse it for stats? If it is video, and you don't consider curl-as-pvr a valid use-case of curl'ing -- how about presenting the text-overlay as a text/html/rss-feed? Mix it at the client for those that want video, or show it as an RSS stream for text w/images?

Not to mention that when we demand to have a functional js-parser and dom-tree just to get at the content, things like text-to-speech and many other things (including building a search-engine!) becomes much harder. For very little (I'd say no) gain.