I guess it's so big to google because they are already so hackable? Because comparing its impact to the creation of the http protocol seems a bit bizarre to a normal person.

I did not know that the uk TLD was signed until today. Being curious I checked a few more country TLDs, most countries are not including France, Germany, Belgium, Canada, Australia and Netherlands but the EU, Pitcairn Island, Brazil, Sweden, Denmark are.
To secure Websites, surely the browser would need to check a signature in the eb page and then verify it against the DNS records to validate the IP address. This would be a useful feature if you could ignore traffic requests to load content from other websites which are not signed by the zone