[PeCaN]

I developed most of my hobby projects in C until recently. It's not as rare as you think. C is a good language to think in.

Lately I've been switching to Ada, which I actually quite recommend if you like C. Shame it never really caught on, but using C libraries from Ada is trivial so there's not much of a library issue in spite of lack of popularity.

[osweiller]

~5% of developers, while small compared to the whole, still encompasses about a million of the estimated 20 million developers worldwide.

The other poster rightly mentioned the embedded space, and that is absolutely true (and indeed it is where I gained my affinity for C and C++), however there are easily 20 middleware / web / mobile developers for every embedded developer.