I disagree with the characterisation of AI as "another blockchain: a solution in search of a problem". The two industries have opposite problems: crypto people are struggling to create demand, AI people are struggling to keep up with demand.
Today, 10 years ago crypto was what everyone wanted, you can see how bitcoin soared and crypto scams was everywhere and made many billions.
And no AI is not struggling to keep up with user demand, it is struggling to keep up with free but not paid demand. So what you mean is AI is struggling to keep up with investor demand, more people want to invest into AI than there are compute to buy, but that was the same for bitcoins, bitcoin mining massively raised the prices on GPU due to how much investors put into it.
But investor driven demand can disappear really quickly, that is what people mean with an AI bubble.
That's not even considering the probability that demand could slow as people lose interest.
Regarding people losing interest: are you willing to bet with me that there will be fewer than, let's say 500 million active users of LLMs in 5 years?