I would rather attribute the current pace of things and C and C++ popularity to what is invested in those languages. Tons of big projects are written in C and C++. Many of them were begun during times when performance was a
major issue unlike today. Also the ability to find contributors for a C and C++ projects is going to be far easier than for projects written in say Go or Rust or any other relatively suitable language. Not to talk about libraries even.
For a typical new desktop application, C and C++ have been long dead for at least a decade now, thanks to C# and .NET. It's a tad different on Linux and Mac though.
If we were to start from a scratch, I'm sure C wouldn't have such popularity as it had 20 years ago. The language is inferior by it's design on modern standards. Yes, there are domains where it's still relevant, but consumer PC(or let alone mobile) is not one of them. If C were relevant, I'm sure we'd rather write mobile apps in C instead of say Java.