One cannot teach new tricks to old dogs.

What has made relevant was the rise of FOSS UNIX clones and the GNU guidelines for using C.

All major desktop OSes were already on the path of adopting C++ frameworks. BeOS, Windows, OS/2, Mac OS.

Thankfully C has been shown the door on Apple, Google, Microsoft, Sony, Nintendo and ARM platforms.

Others will follow.

FOSS UNIX clones and old time embedded developers are the only ones keeping C relevant.