It's the container registry that I'd miss, not the actual container functionality, and that's what would have me reaching for Vagrant and distro packages again until something similarly good arose (or maybe there already is a viable replacement, which I'd find via search in short order if I actually needed it)
The real conclusion from your logic would be: why would you go to Docker rather than just using Vagrant?
My point was not to defend Docker, but to suggest that Docker is increasingly irrelevant to the broader ecosystem.
I wouldn't use Vagrant because I (like many people) always target an orchestrator and not hypervisor or bare metal.
I use Docker as a nigh-universal package repository and package manager, with a huge and up-to-date selection of packages. It gives me a consistent way to run daemons my software depends on, nearly everywhere, including pinning the version and ensuring they all use the same config. It's docker-hub, really, that provides most of the value I get from Docker on a day-to-day basis, and that's the part I'd miss. I know there are other ways to create images and run containers, but I almost never create—or even modify—them myself.
