Well, it seems the old stigma against multi-language systems is fading. Even 5 years ago, it was more or less "the rule" that you chose one language for a project and you had to live with whatever trade-offs that choice left you with. Now, people are more willing to accept that you can write much of your system in a language designed for programmer convenience and only write the bottlenecks in a more performance-oriented language.
This is true, but if you use C for the right use cases it is possible that actually higher level programming languages will not be a less time expensive pick, as if the use case is right you'll end spending a lot of time into optimizing performances, OS low level access, memory usage, ...
Web applications which rich client-side interfaces might be the reason for the change in thinking. In a web application, you anyway have JavaScript to deal with; and until a few years ago, the server-side code was written in some other language.
