Yeah that is certainly possible. We could have ended up in a world where GitHub was actually MercurialHub and git probably would have remained the VCS of the ke

Yeah that is certainly possible. We could have ended up in a world where GitHub was actually MercurialHub and git probably would have remained the VCS of the kernel and probably many C and C++ projects as a result but much of FOSS (especially the new at the time JS movement) could have ended up on Mercurial instead.