I would guess that people who are addicted to it or whose job depends on it are not the majority of Twitter users.
I agree that even out of those groups, there are not a lot of people deleting accounts and moving to other places. But, my perception is that a lot of people are indeed spending much less time on Twitter. Twitter competitors are not only Mastodon or Threads. It is also YouTube, TikTok, Instagram, Netflix and alikes, advocacy for consuming less social media overall, etc.
I agree that even out of those groups, there are not a lot of people deleting accounts and moving to other places. But, my perception is that a lot of people are indeed spending much less time on Twitter. Twitter competitors are not only Mastodon or Threads. It is also YouTube, TikTok, Instagram, Netflix and alikes, advocacy for consuming less social media overall, etc.