I just looked at https://github.com/containers/libpod/blob/master/docs/tutori... .
For debian/ubuntu users (of which there are a fair quantity) whilst podman's install process looks like that, I don't see it taking over from Docker any time soon.
Not to mention Windows/OSX users.
Ease of use should not be overlooked when it comes to developer tooling. Podman can be the most technologically advanced solution, but if it's a pain for developers to get going with it, it's not going to replace Docker any time soon...