Not only no to NaCl, but hell, no. We're just on the cusp of cracking the Microsoft operating system monopoly and we're going to shore up Intel's processor monopoly? We are definitely getting into the evil zone, here. It's pretty hard to compete on price with a company that dominates the market but, from the technical standpoint, Intel's power consumption and die size are way greater than comparable RISC processors. Hardly Green technology.
Java was developed from the ground up to be verified and it does the job darn well. I'm starting to see benchmarks where it goes toe to toe with C, once you are done with JITting the code. It's well proven and platform-independent. Please, Google, let's stick with something that is already working. And, of course, if you want to spend time and money making Java run faster, that would not be evil.