Currently known AI is not zero-value. Even if it makes no progress from where it is now, it will profoundly change society over time. And there's no reason to believe that the stuff that's been made public is the "top of the line in the labs" stuff. (Actually, there's pretty good reason to believe that it isn't.)
So there's plenty of real stuff, as well as an immense amount of hype. When the AI bubble pops, the real stuff will be temporarily undervalued, but it won't go away. The hype *will* go away.
FWIW and from what I've read, 80% of the AI (probably LLM) projects don't pay for themselves. 20% do considerably better than pay for themselves. (That's GOT to be an oversimplification. There's bound to be an area in the middle.) When the bubble pops, the successful projects will continue, but there won't be many new attempts for awhile.
OTOH, I remember the 1970's, and most attempts to use computers were not cost effective. I think the 1960's were probably worse. But it was the successful ones that shaped where we ended up.