Earlier quoted context omitted.
It really isn't. The entire purpose of servo was to be a vehicle for r&d with the eventual goal of merging code back to firefox. It succeeded. No one used it because that really wasn't the point.
I think you're right in that that was the original sell, but it's not how they sell it today. "Servo’s mission is to provide an independent, modular, embeddable web engine, which allows developers to deliver content and applications using web standards." So maybe they're just not there yet? But in my opinion, if you create popular software and no one uses it, it's not popular from its adoption, it's popular for some…
Wait, you're working with web tech – probably the most archetypal field where preventing security vulnerabilities is the top priority – and you don't see the benefit of using Rust instead of C?