alt Hacker NewsI came here looking for a comment suggesting just that. But surely there is some massive issue with this idea we are overlooking? Otherwise I don't see why it hasn't already been implemented long ago, it seems so obvious as a mitigation.
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Is it not obvious that not every global .com website owner wants to use only have the choice of US-run CAs (which can be subject to National Security Letters)? If you permit some other countries to certify .com then you're back to the same political question of which countries are allowed to run CAs.
It's also not at all a given that website owners would prefer the national CAs -- as an obvious example, most Rust projects (foo.rs) would probably not trust the Serbian CAs as much as they would LetsEncrypt. Even for website owners that live in the country, it seems possible that Chinese website owners might prefer to use non-Chinese CAs. And again, if the solution is to just special-case one American legal entity then we have just moved back to the original VeriSign-signs-everything model.
The real issue is that the CA model has been obviously broken since at least the days of the Comodo hack -- the trust decision for who can certify the website identity is made by the website owner but really clients are the ones that actually care (it's their data at the end of the day) and they have no input. Moxie had a proposal in 2011 to fix this by letting clients decide the policies for how a certificate should be trusted[1] and I think it is a far more workable solution than the alternatives. If one of the LetsEncrypt intermediates was compromised none of the alternative proposals would have any real hope of providing a workable mitigation.
Legacy CA/Browser Forum politics.
Also the industry has changed a lot since Let's Encrypt. You could have argued against monopolizing the CA issuance to just a few countries/entities as sovereignty issue, and CAs were indeed exhibiting extreme rent-seeking behavior before Let's Encrypt. With a guaranteed free and accessible alternative in the mix, the weight of the arguments against would change.