Apple's not going to spend several million dollars of engineering effort to create another C++ compiler if nobody's writing C++. Companies aren't going to spend money on sending representatives to C++0x standards meetings if their customers aren't using C++.
People are realizing that they don't have to program in C++ for many different areas. That doesn't mean that they're aren't still writing parts of their apps in C++. And there's a lot of existing C++ code out there that still has to be extended, debugged, and maintained.