It's 26 years after Java was released. Java has largely been the main competitor to C++. I don't see C++ going away nor do I see C going away. And it's almost always a mistake to lump C and C++ developers together. There is rarely an intersection between the two.
I think you do not understand how short 10 years is. There are tons of people still running computers on Sandy Bridge.
Ten years is about the time since C++ 11. I may be wrong, but I do not regret my estimate.