No need to settle on one language. There is in fact room for 2 main languages (prolly some will simple come along like JS and Bash). Python you already have, I

No need to settle on one language. There is in fact room for 2 main languages (prolly some will simple come along like JS and Bash). Python you already have, I'd not ditch it, it can live. Main thing it lacks, imho, is a type system which relates to 1 & 2. I'd personally not care for 3 too much. You find less Haskellers, but also less competition, and according to many they are better. I'd say all 3 langs you named allow point 1 "well enough". Point 2, I'd say: Haskell > Go > Python, with significant margins in between.