I was wondering "why NetBSD???", other than as a possible hobby project, but your explanation gives a pretty clear answer. I've never even heard of rump, and know little to nothing about NetBSD, but this sounds really, really interesting. In my spare time I'm writing a "fantasy console" (along the lines of pico-8) that will run in a framebuffer. I wonder if this would be a good fit.
Forget Docker, the future is unikernels! [0] I haven't gotten to play with them much, and the ecosystem is very, very young, but the idea of it all is very intriguing to me.
How can you compare a kernel application vs a process isolation layer? Containers will be adopted to dynamically load kernel modules and then we'll have dynamic "rump" kernels, but saying to forget Docker and the future is Unikernels, doesn't make a lot of sense technically.
