While servo shares an ecosystem with Firefox it is far more independent than chromium is so I would suggest it is the most likely emerging alternative browser e

While servo shares an ecosystem with Firefox it is far more independent than chromium is so I would suggest it is the most likely emerging alternative browser engine and browsers built on it could become roughly as different from firefox as safari is to chrome. It's not like other areas are so different, the number of compilers that are keeping up with LLVM and GCC has dwindled to the point that I can't name one without checking if it is EoL.