They stopped being used as primary weapons because better ones were found - mostly firearms - not because people got bored of it; or reverted to some earlier methods of warfare.
Yes, there is the general class of technologies (warfare, computing ...) and there are particular instances of those for a given time and space and evolve as the landscape changes.
The technology of warfare evolved to better mechanisms, perhaps same with computing.
Bows and arrows are still widely used for hunting all over the world. I was able do freelance work on a relatively low income because of access to ~150lbs of deer meat that came from multiple bow-hunted deer.
This is an interesting question that I haven't thought about, thanks.
What we currently have is a simulacrum of thought - albeit a good one.
Any technology is useful only in the sense that it helps us with solving the problems we are dealing with in that time. When we face issues that a pseudo-thought is not useful in tackling or worse is one of the causes - this will recede in the background.
Beyond that, the implicit assumption in the question is that thinking is the highest form of activity that is useful to us.
I don't know how my thoughts arise but thinking happens when I engage with them. I think what we look for is meaning in our lives and thinking helps us generate/achieve one, whether real or illusory.
I don't know about you, but I can buy bows and arrows at hundreds of sporting goods stores in my local area alone, and I even know of 2 local blacksmith shops that sell swords.
Castles still exist as well, you just aren't invited to them (which was true for us peasants back in the day, too). Trump is still trying to get one built under the ruins of the East Wing, in fact.
But are these actually completely different technologies, and if so, where is the dividing line? Firearms certainly have not decreased in significance, and they're the modern version of a bow, which is simply 2 iterations later in propulsion methods: tensioned string -> high-tension cable -> high-pressure gas.
Are LLMs really going to fall off in significance, or will it just be the nth newest incarnation of LLMs?
The function of what an LLM does (generative language) is what people seem to take issue with, but the function is here to stay, even if the next iteration has a different name or method.
The difference is in what other enabling technologies do you need to achieve it. Advanced technologies sit on a pyramid. One can build a bow and an arrow from sticks, string and rock. For reliable firearm we need chemistry and advanced metallurgy.
My view wasn't whether generative language is here to stay or not but rather will it continue to be a significant thing or not.