Ban in public spaces might not make sense since there isn't a proximity hazard like smoke. But I can imagine after kids are banned from social media and we see how this was an obviously positive effect on their mental health, we will begin to acknowledge that this stuff is toxic for adults as well.

We could start to ban many of the mechanisms social media companies have deployed over the last 10 years. Infinite scrolling, algorithmic feeds of "creator" content, AI generated ragebait from bot accounts, etc. I'd love to see social media reverted back to when it was just holiday photos from your friends.