First, massive hype drove tons of users to try this flashy new thing. The talk of the town. But the vast majority of them were not genuinely looking to integrate a new tool into their toolbox. They just wanted to know what all the fuss was about.
We see the same thing with Meta's Threads app. Massive hype created a huge spike at first, but the majority of those users (myself included in this case) had no real intention of making Threads a daily part of their life. They were just curious to see what the big deal was.
I'm willing to bet (but obviously don't have the data) that the number of users who use it multiple times per week (if not multiple times per day) is climbing, and climbing fast.
Second, I'm less interested in knowing ChatGPT's adoption rate than I am in generative AI's adoption rate overall. ChatGPT was the introduction for most people, but for those of us who chose to make it a core part of our toolbox we quickly discovered a wide array of other incredible generative AI apps.
Finally, I think anyone who is actively using generative AI for their work is never going to go back. It's too darn useful. It may take a while for the general public to wrap their head around how to make this a part of their lives, but for those of us who do, the benefits are profound. We see the reality of it and don't need to see trend numbers to inherently grok what's happening on the ground.