This just makes it even harder for sysadmins and builders to keep their sites online.
So many levels where the web service can go offline, from the hosting, to the registrar's DNS, even to the whole data center's networking. This happened to me recently, and it screwed my services for a few days.
I think the best option now is to keep backups which are packaged in a way that lets you quickly deploy to a different DC.
All this is ok, but to move to another server, it is necessary to make a specific update to the DNS records.
And that is also impossible here, because they are completely unavailable. Not much can be done if the domain is also registered with them.