It was always and will always be the case that you "futureproof" yourself in a field by getting the basics, not by following the latest trend that may or may not be relevant in a few months or years.
Open weight models at a minimum are not going anywhere. It is delusional to think we are going back from this.
I never said sth about "going back" but we can have all the "skills" related to current models/agents completely replaces by new skills in a completely different paradigm in 5 years. The same way that the early "prompt engineering" skills are irrelevant now. But understanding how a computer and a program works in a fundamental level has stayed more around than any other trend.