Google has their own fleet of atomic clocks and time servers. So does AWS. So does Microsoft. So does Ubuntu. They're not going to drift enough for months to cause trouble. So the Internet can ride through this, mostly.
The main problem will be services that assume at least one of the NIST time servers is up. Somewhere, there's going to be something that won't work right when all the NIST NTP servers are down. But what?
The main problem will be services that assume at least one of the NIST time servers is up. Somewhere, there's going to be something that won't work right when all the NIST NTP servers are down. But what?