Before Google I worked on an academic project that built a small Smalltalk-like VM that was also a compilation target for something that was very close to unthreaded Java. Worked pretty well.
This would indeed be nice but it seems that google wants to push the language more than the VM. I quite get this because saying "you can now run your favorite language for the browser" seems much much more attractive than saying "look we made programming language 1001 and this is what you people should be using now!".
> In general it's easier to put a typed language on an untyped runtime than it is to put an untyped language on a typed runtime.
I have no knowledge of how one would do this but a lot of dynamically typed languages exist for the (I am assuming) statically typed platforms such as the JVM and CLR now.