So git is to github as (chroot/cgroups/unionfs) is to docker et all?
What is the VC company that is going to spring up around WASM?
You could do docker-alike runtime things with lxc and e.g. squashfs filesystems. That is IMHO a good signal to say it's not the tech.
I see it more as developer workflows. Github looked at git and LKML working model and put that into a centralized UI. The revolution was individual contribution (not teams) and personal repositories. (Does anyone remember the other scm hosting tools before? I remember running some open source sorceforge alike thing)
Docker took all the pieces before you could run a container and made those easy to achieve (building, sharing, pulling, ...).
That's developer workflows.
The developer ecosystem is always the primary path to success.
The same thing with Raspberry Pi. There are a million $notmuch single board computers with fruit names, but the Raspberry Pi has dominated much more powerful systems for 10 years now because of its top-tier software.
This is also what they are trying to do with wasm and what (in part) GitHub did with git: creating a developer ecosystem.