There have been thousands-millions of proposals since the dawn of the internet that got nowhere.

To exist is to recognize the material constraints of reality; there are things humans won't ever discover. Ergo we have to prioritize what is useful.

This proposal is not useful. It goes against the fundamental interest of website owners to differentiate and build up a moat around direct user relationship and data. WebMCP is frankly just a land grab attempt by Google to get more free stuff from publishers.