>C pretty much runs anywhere, after all. What exactly does this bring to the table?

1. No, C doesn't run everywhere. I can't compile C to Java, C#, JS, AS, Perl and D. Or compile it to any other language (PHP, Objective-C, Pascal, ...) just by writing 500 lines of generator.

Look how huge project Emscripten is: 1 537 390 lines according to Ohloh. But JS generator for Ć is only 457 lines.

2. C# is easier than C. You can write Ć in Visual Studio C#, the best, easiest and fastest IDE in the world.