I don't see how this will end the "free web." No publisher will be forced to use DRM. Anyone can still create a website and make it accessible to anyone for free with an internet connection. If certain publishers want to require ads to view their content, that seems like their prerogative.
Until Google Search starts punishing sites that don’t require a trusted execution environment…
All you need to do is to jingle some real, if small SEO/ad advantage and people will bend over themselves to lick Google's boots.