This not only kills pages, but it kills the concept of a browser where the user agent is a human, rather than making your pages be designed where the user agent is an AI agent.
That doesn't make me happy to experience because I'm guessing that after a generation or so, web designers will not only do mobile first designs with stupid amounts of white space and not taking advantage of the desktops greater screen real estate and precise mouse movements, but AI first websites will get so popular that browsing sites manually will look like trying to use a text only browser in the JavaScript world.
Easy for me to do a depressing take, but hopefully the bitter lesson of AI will help this particular projected future not come to pass because the AI will get smart enough that it will embed a browser right there in line and just render the window for the user, or it will otherwise gets good enough at screen scraping and UI automation that it can just use an existing browser, just like a human, the sites won't be dumbed down even further for AI consumption.