Comment by phasmantistes

(Disclaimer: I am tech lead of Let's Encrypt software engineering)

I'm also concerned about LE being a single point of failure for the internet! I really wish there were other free and open CAs out there. Our goal is to encrypt the web, not to perpetuate ourselves.

That said, I'm not sure the line of reasoning here really holds up? There's a big difference between this three-hour outage and the multi-day outage that would be necessary to prevent certificate renewal, even with 6-day certs. And there's an even bigger difference between this sort of network disruption and the kind of compromise that would be necessary to take LE out permanently.

So while yes, I share your fear about the internet-wide impact of total Let's Encrypt collapse, I don't think that these situations are particularly analogous.