[devit]

What about the concept of turning Gecko into Servo piece by piece?

That is, continuing the Quantum work until there is either no C++ code left, or the C++ code left can turned off via config option ("prefer perfect security over perfect compatibility") while still having a browser that works on the vast majority of the web.

[kibwen]

Servo components will continue to be uplifted into Gecko (e.g. WebRender and Pathfinder are on track to be in Firefox later this year). But ever since Servo's original announcement people from Mozilla have been explicitly saying that people should not expect Servo to wholesale replace Gecko in Firefox.