This is also what they are trying to do with wasm and what (in part) GitHub did with git: creating a developer ecosystem.
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.
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.