Unfortunately in the current landscape, I think Firefox will unlikely gain the traction again even if we can bring those big techs to a fair playground. Browser development becomes an extremely complex, expensive project that requires at least hundreds of engineering headcounts and Mozilla cannot simply afford it. Worse, Servo was a kind of big bet to change the equation from the ground but Mozilla decided to abandon…
Servo was not abandoned, it was setup to act as a proving ground for various techniques, and the things that worked out well were integrated into Firefox. The group was disbanded because they accomplished their initial goals.
I don't think it has achieved its original goal and gracefully disbanded, unless I see any strong evidence that the decision was primarily and independently driven by the Servo/Rust engineering leaders.