There's a pretty huge library of OpenGL programs out there, so I would expect the drivers to include those APIs for a decade or two, I hope?

The OpenGL specification does not define specifications for interaction with windowing systems. Consequently, programs using OpenGL must use an external GUI toolkit. The program in Listing 1 uses GLUT ...

OpenGL is used to illustrate implementation of these techniques. Weekly assignments comprise a sequence of increasingly complex OpenGL programs that seeks to build practical experience using OpenGL.

OpenGL and CUDA and DirectX are not technologies that I would expect to die out overnight, just like C# didn't kill Java or C++ didn't kill C or ARM didn't kill the x86 and SSD didn't kill HDD.