If you look for the stream of articles that invaded HN in the last weeks, it is usually because someone implemented a web site in Ruby or Python and when it gets scalability problems all is heaven on earth with Go.
Of course if you're doing server side development already with more performant languages and runtimes, there is little incentive.
Of course if you're doing server side development already with more performant languages and runtimes, there is little incentive.