Rust is the right approach since it figures everything out at compile time. But it still has to prove itself. And what is the timeline for a browser completely re-implemented in Rust? 5 years? 10 years? Suggesting that throwing away and rewriting our entire software foundation that has been written in the past 50 years is just silly. To be realistically achievable we need an incremental approach to gradually analyze and fix old software instead of throw-away-and-rewrite.
Luckily, with Rust's great FFI, it's easy to peel off a component and re-write it, you don't need to do the whole thing. It's not like Firefox is getting transpiled to Rust tomorrow, we're just replacing bits and pieces, slowly.
