That's really cool. I didn't know about that. Thanks for sharing.
There's a few things that seem to make it unsuitable for the intended use case of dockerc:
* The container extracts itself which means there is quite a bit of overhead for large images. dockerc-built executables have the same startup time whether the image is 2.2GB or 25MB.
* The executables produced by enroot don't seem suitable for running standalone. At least the example doesn't seem to suggest so.