People like LLMs, will they pay for LLMs to offset the investments? Will they pay enough so these companies can stay afloat when the slush funds inevitably run dry?

Will LLMs create a significant shift in productivity where its usage will create enough overall value to the economy to justify the hoovering of capital from other industries?

Those are the unknowns, I don't think many people are saying that LLMs have no value like NFTs, it's that the money being pushed onto this novelty is such an absurd amount that it might pull down everything else if/when it's discovered that there won't be enough value generated to compensate for trillions of USD in investments. Hence the comparison to the dotcom bubble, we came out of that with the infrastructure for the current internet even though it was painful for a lot of people when it crashed, will we have a 2nd internet-esque revolution after this whole thing crashes?

The technology is definitely valuable, and quite fantastic from a technical standpoint, is it going to lift all the other boats in the rest of the economy like the internet did though? No one can tell that yet.