Problem is the effort to find a vulnerability and exploit it is often higher than the effort required to patch it. Because by its nature a browser and the server it talks to are internet connected, Google will be able to revoke keys for older exploited versions at will. As long as it’s well-engineered I think there’s a good chance they’ll be able to keep that secure.

Though I’m sure there will be some successful approaches to ad blocking etc but if something like this gains traction it could completely change the internet. If enough people are running browsers like this then sites could effectively be able to kill off competing browsers that aren’t restricted.

I think the key is to not let it happen in the first place, and boycott browsers that implement stuff like this.