We have already the first customers asking about migration support to Proxmox or Openstack, but I have the feeling it is more a panic reaction than them having thought through this. Proxmox has a policy of only communicating by mail so even urgent cases will take very long, the reason why we gave up on partnering. Openstack is still a complex thing and a private cloud is different from virtualization solutions so you need to rethink many small things. My guess is many will land on HyperV not having learned their lesson of vendor lock!
From my experience at customers it is very hard to convince the network team (which is typically someone else then the team responsible for Foreman/Configuration management) to use something else then the vendor provided management tools. So I fear even if it is great to have the option, the user base will be small.
We had it, as it was not used in greater numbers it was deactivated. Disable the "Redmine Vote" plugin