Quantum I think was too incremental and conservative, trying to integrate Servo into Gecko. They’ve ended up making a desktop browser which is as good as Chrome, but not good enough to demand attention. Mobile, where parallelism should be most beneficial, has lagged behind, and parallel layout, which is where the real prize is, has disappeared over the horizon. Servo has been relegated to WebVR experiments which are speculative at best, at a point when VR is only available to a truly tiny percentage of the population, and should it be successful will probably be dictated by market share anyway. Do Quantum by all means, but follow five other paths to make Servo a success. Servo was designed to be embeddable, why for instance not attempt competition for Electron. Even if it only implemented a subset of the spec it could be a big success. This is Mozilla’s lifeblood, and it just seems attention is elsewhere.

It should be noted there have been side projects to back nodejs with spidermonkey [0] and have electron APIs backed with gecko [1].

I agree with you and the thing I want more than anything is a cross platform browser engine embeddable with a supported C API that's not Chromium. Servo was on its way, but work has definitely slowed. But I acknowledge that even though I would build my own browser UI on top of an embeddable gecko engine, it probably won't affect adoption that much to be worth the effort.

0 - https://github.com/mozilla/spidernode 1 - https://github.com/mozilla/positron