I don't think that people relying on the tools too much is the first sign I would identify to mean the bubble is popping
No, the clue is people realizing that relying on the tools costs too damn much. The tools may be fine-ish for what they do, but there might be a bubble built on unrealistically high expectations of revenues.
The market is priced at expecting AGI levels of breakthroughs. Just a very useful tool for programming is definitely not enough to keep the music playing.