Rewriting the browser stack in an evolving language feels like trying to shoot the moon. However, I hesitate to bet against Mozilla when it comes to impossible rewrites.
I love the idea. It will give Rust lots of feedback about real-world, practical problems that arise on large-scale software. I think it will make it all that much more likely that Rust will be an industrial strength systems language.
Yep. It's a high-risk project, but the pay-off could be huge (both for programming languages and browsers) if they pull it off.