It's that "it's only going to get better" part that is driving the bubble, I think.
The market has this idea that over the next year, we're somehow going to have AI that's literally perfect. Yet that's not how technology works, it takes decades to get there.
It'd be like if the first LCD TV was invented, and all of a sudden everyone is expecting 8k OLED by the next year. It just doesn't work like that.