I started in this field in 1992. I've seen the coming and goings of many flash-in-the-pan technologies.
If you are a dev and are selling yourself on your skillset, ask yourself, "is this sustainable?" The answer is "no." A fifty-year-old brain simply does not absorb new technologies as fast as a 25-year-old-brain. If your plan is to continually adopt new cutting edge technologies in order to stay marketable, I politely submit you need to rethink your long term plan.
As an almost 50-year-old, I promise you that the world is not a gentle place for older devs. Plan your exit into management, a related field, or some other job altogether. If you expect to be a coder at age 50 you're going to be disappointed.
As for me, I jettisoned the "technical skill set" war decades ago. I do not sell myself on my technical skill set. I sell myself as the ultimate generalist. This comes with its own set of problems. However, it has allowed me to age more gracefully in my field, because I do not create the expectation that my primary value-added is code generation.