I think configuration management systems like mgmt (or Ansible and Puppet) are here to stay.

I think so too, however "mgmt config" builds a lot of radical new primitives that Ansible and Puppet don't have. It's been negative for my "PR" to classify it as "config management" because people assume I'm building a "Puppet clone", but I really see it as that space, it's just that those legacy tools never delivered on the idea that I thought they should have correctly.