“Next time” will be in 2035. Hopefully by then things will be smoother.
To be clear, it’s not just that “a” certificate expired… SSL certificates are stored as chains where each certificate is signed by an intermediate certificate and the intermediate certificate is signed by a root certificate. There are only a couple dozen widely-recognised root certificates in existence (so your browser and OS don’t need to know the certificates of potentially millions of web sites). This problem came about because one of those root certificates (and a very widely used one) expired. Normal SSL certificates expire relatively frequently (generally under a year, almost always under 3 years; Let’s Encrypt is by default 90 days), but the root certificates generally have expiration dates on the order of 20-25 years.
(The catch is every time something like this happens people say “next time, we’ll do better” and they probably intend to, but 15 years can be quite a long time to keep those intentions over).