We've already trained it on all the data there is, it's not going to get "smarter" and it'll always lack true subjective understanding, so the overhype has been real, indeed to bubble levels as per OP.
What is your basis for those claims? Especially the first one; I would think it's obvious that it will get smarter; the only questions are how much and how quickly. As far as subjective understanding, we're getting into the nature of consciousness territory, but if it can perform the same tasks, it doesn't really impact the value.