1) Our industry is obsessed with new and shiny.
2) There are a lot of developers and companies who don't have the time to invest in a new paradigm or language.
3) By learning/using golang these developers and companies can look "hip" and forward thinking with minimal effort.
With a Java background and a 10 hour investment in golang you can write decent software.
With a 10 hour investment in Haskell you can't do anything.
While you might think it's worth spending 100+ hours learning Haskell, I don't (at the moment) have any reason to Haskell as a better time investment than anything else on that list.. why should I give it more than 10 hours?
So while I'd love to write big chunks of Haskell, if its just me doing it, that code will be nuked and rewritten unless I also undertake a project of education. So accessibility is key. Go/python/js seem to win in that regard, and likewise in access to libraries.
So unless as an organisation there is motivation to step up skilling, e.g. because there is a lot of money at stake if something breaks (e.g. trading software), or because there is a community of practice (compilers) its hard to see Haskell gaining much ground.
Likewise all those other languages has their niche, and it is hard to seem them displacing each other.