Servo was never supposed to be a browser. It was a testbed for new browser tech/components, some of which got ported into Firefox. I had hopes that Servo would also be an embeddable browser engine, but not sure if that was ever a serious goal.

Servo still exists and has been spun out of Mozilla's org (https://github.com/servo/servo/). Certainly development will be slower without a dedicated, paid team behind it, but it's still alive (last merge to master was 9 days ago). And perhaps without Mozilla's direct control, it will actually end up becoming the browser you hoped it would be.