In the end, I think Servo is better served by being in the Linux Foundation rather than under Mozilla, as Mozilla seems to stray further and further from the path they were walking a decade ago, sadly.
Servo seemed like a great project for Firefox. Both in the near term, by merging parts of servo like the CSS engine, and in the long term by promising a much better rendering engine than anything else on the market.
But sadly good for Firefox doesn't mean good for Mozilla. Making a great browser isn't necessarily their highest priority.
well...look at thunderbird - mozilla basically let it go as well and it made spectacular come back with a huge funding from users / community... as if user do like to contribute directly to the software development and not the mozilla org with it's weird golas... food for though...