The answer might be as simple as "people tend to work on games on the weekend", either as hobby projects or that professional game developers work weekends more

The answer might be as simple as "people tend to work on games on the weekend", either as hobby projects or that professional game developers work weekends more often, skewing the weekend results away from serious enterprise apps. This would explain both the rise in low level languages but also things like OpenGL, Unity3D and Actionscript 3. It doesn't explain Haskell, of course, but I think the Haskell explanation in the article is accurate.