So, are we seeing a fall of microsoft from the developers' point of view? Are windows phone and asp.net mvc not enough to try to get back the hackers in the platform?
The initial audience of the site was, ergo, primarily windows developers. As popularity grew, more developers from the broader community showed up, driving the proportion of windows questions down.
Considering there are 58.1k close votes to review at the moment... that's loads of dupes.
My personal experience has been that I rarely need to ask new C# or MVC related questions these days. I really have a hard time coming up with something has hasn't been discussed already. I think Stackoverflow eventually hits a saturation point and people begin to consume more than contribute.
Perhaps, given this data is from a Q and A site, these languages have just gotten so amazing in the last three years that developers are collectively asking fewer questions because they're running into fewer critical / main sequence blocking issues. Maybe these languages have moved to only being deployed by established and professional shops, leading to less of the entry level developer "noise" questions on SO
[e]: sibling comment explains these trends, quite convincingly, as site demographics.
I'd love to see this data compared to a similar set from github. Although public repo stats would suffer the same selection bias as SO posts.