That's all concerning the content though. If you don't want HTML and Javascript and video streaming and EPUBs on the web, you don't have to use them. None of that concerns HTTP itself, which is developed by IETF.
You could fairly easily make your own web browser that uses HTTP and only reads (gem)text files and ignore the rest of the web.
Or just use Lynx.
Pushing your own standard seems to only add to the complexity of it all. Now if you want to make browser that can read all the text pages, you have implement HTTPS and Gemini.
You are again conflating HTTP and 'the web'. The stuff you are talking about for web browsers has nothing to do with the HTTP protocol. In fact, many many things use HTTP that are not part of `the web`. Most APIs these days are HTTP based, but do not exchange HTML or any web content.
You could fairly easily make your own web browser that uses HTTP and only reads (gem)text files and ignore the rest of the web.
Or just use Lynx.
Pushing your own standard seems to only add to the complexity of it all. Now if you want to make browser that can read all the text pages, you have implement HTTPS and Gemini.