Technologies fade away when they are no longer useful, cost/benefit ratio is too high or something better comes along.
It is question of when.
The technology of warfare evolved to better mechanisms, perhaps same with computing.
We might design organic brain extensions, so people just become smarter, making LLMs obsolete. (Brain-Bluetooth interface for additional cost)
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.
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.
The Juicero is here to stay! There’s no putting the genie back in the bottle.
The technology involved in Juicero (or Pets.com, or many others) didn't go away. We could rebuild them any time we wanted to. Those things went away because they weren't able to make enough money to be an ongoing business.
Will AI? That is at least an open question at this point. (I mean, in fairness, Amazon's was an open question for many years too.)
The tech isn't going anywhere. Is there a path to a sustainable business model that uses that tech?
You may have an answer to that question. Can you prove it to someone who doesn't already agree with your answer?