The Nixpkgs Core team was established in Sept 2025 (https://discourse.nixos.org/t/establishing-the-nixpkgs-core-...), so it is a fairly new concept and idea. They've accomplished some good things as highlighted in the post, but are now stepping down. Yes, we'd prefer for the team to exist, but we've also functioned without one for ~20 years. It may take multiple iterations to bootstrap the concept and to figure out the right structure - or we may find it isn't needed. So no, this is not a critical emergency. It's a return to the status quo of late last year.
That being said, I think it is still a concept worth pursuing.
I agree with the concept but the name is terrible. "Core team" gives one the impression that this is the most important team to the project. It's not! It could be called the "governance facilitator" team or admins or something.
Please name the next iteration something less spicy.
There was an architecture team which existed, I would assume the usage of "core" was to disambiguate.
https://github.com/nixpkgs-architecture