There is still very much a set of users in the incident response community that relies on PGP. These are professional teams that need to communicate with each other. They talk about upcoming disclosures, current abuse, upcoming operations or patches, et cetera.
This stuff is almost all short to mid-term secret. Most of this will become public in a month or so. Leaking meta-data is an assumed risk (or too much hassle to avoid, take your pick).
Encrypted email for this user group is certainly not over, and there is still no realistic alternative for it. So PGP is not going to go away completely.
Until (I assume?) not that long ago, people were also still using icb to work on OpenBSD together. That doesn't mean it's important for us to discuss future directions in icb.
True, but let us acknowledge that those are edge cases. For the average person encrypted email has never been a thing.
I hope PGP remains around for people who do need it. There are people who have a real need for secure communication, and they are probably able to invent a cover story to explain your meta-data leaks. (everyone knows I buy widgets and from him: it is no surprise that we don't want details about our negotiations public)
This stuff is almost all short to mid-term secret. Most of this will become public in a month or so. Leaking meta-data is an assumed risk (or too much hassle to avoid, take your pick).