The author and their sympathizers can easily refrain from using JS and other technologies they don't like in their own sites, and preferentially give attention

The author and their sympathizers can easily refrain from using JS and other technologies they don't like in their own sites, and preferentially give attention to such sites. No technology changes are required for that, except that as another commenter noted, it would be helpful to have a search engine that prioritizes such documents. The problem the author has is not a technology problem, it is that sites restricted to just such documents are not especially popular with most users. People who wish that interactivity etc had never been added to HTML are misguided. (I'm not sure if the author falls into that category.) HTML competed with other technologies (e.g. Flash, ActiveX, native apps); when authors felt overconstrained by HTML they used those instead. If interactive apps were all Flash and ActiveX and native today, and Web apps didn't exist, would that be a better world? Certainly the Linux desktop would be far less usable.