Well compilers do. Microsoft's Visual Studio C compiler doesn't. And as they've pretty much officially confirmed, that they won't support C99, chances are, they will never support C11 either. So in 10 years, the situation will be pretty much the same as today: either you want to support this compiler and adhere to an ancient C standard or you don't and have access to a language that's quite ok.
With gcc being available for Windows for free and the possibility to compile as C++ in VC, I really don't see the point of restricting oneself to the stone age.