[astrobe_]

If you want a decentralized web, a "Userweb" (maybe to parallel a bit Usenet), in my view you need a BitTorrent-like protocol.

You need efficient documents formats, which means formats that don't try to do everything, which means that you have to segregate different document types in different files - e.g. tables in some standard spreadsheet format - in contrast to HTML that tries to do tables, graphic (SVG), etc. on its own.

Separating each thing in their own file lets the user choose which programs they want to view/manipulate documents (rather that the one-size-fits-all browser), help with distribution across the network, and help with low storage/low bandwidth situations (or do more with the hardware we have right now).

So from my perspective, the answer is negative: there's nothing new to invent. Specialize and refine what was already invented.