For production server? No. mostly NixOS is for desktop.
Ansible cover what nixOS doesn't in Debian/RHEL space, and it's idempotent and better than nixOS config. Unless they change their approach for server, I don't see any way in near future it will be massively adopted.
I'm agree with this point of view.. CIQ narrative have too much conflict of interest. In my place, most corp are happy with CentOS Stream being able to be the upstream test before landed on RHEL. At least now they don't need to long to put on Fedora to be landed on 3 years cycle like old times...