This is crazy. So crazy and ambitious. Running a full software stack on a very limited syscall set? You're basically re-defining an OS abstraction, much more so than Firefox OS or Chrome OS. It's the logical continuation of android and ios, at the browser level. So now your browser/OS is only comprised of $(curl | exec -) ?

But there are so many problems to solve. Skimming through the paper shows OP has thought of more problems than me, but there are so many more to solve(yet unforeseen) before this could become even a bit usable. But if you succeed, Microsoft should be worried (and kill your project).