Excited to see the renewed interest in Servo. Another new web engine that is coming along nicely is SerenityOS LibWeb: https://github.com/SerenityOS/serenity/tree/master/Userland/...
While I share the hope, the situation is (imho) very different. OpenVPN is FOSS while Chrome is proprietary... OpenVPN is a tool which still helps many many many users while Chrome is a mixed bag - pretty good browser made by a worlds largest advertising company.
I was around when webkit browsers started to appear. Back then, the engine was leveraging almost a decade of work on KHTML. It wasn't something pulled out of thin air. All popular browsers nowadays have their roots in 90's and early 2000's codebases.
Servo is a very cool project as well, I'm rooting for them!