Change is the only constant, I guess. This has always been part of anything computer-related. My dad started his career with punch cards, ended doing Java. You keep learning. But you've got to do that to some extent in every career.

If anything, things are stabilizing now more than ever before. Java and Javascript are almost 30 years old, and still as relevant as ever. Computers have been "fast enough" for most purposes and aren't obsolete the moment you've bought them, like they were in the early 1990s. The x86 architecture is surprisingly still with us. And despite all the new languages and frameworks, there's still tons of stuff being done in all of the old ones. They don't get obsolete as fast as they used to.

You can never do everything. Pick what you love, and focus on that.