[armchairhacker]

It's not just that. Some kids live in unsafe or car-centric areas, with parents who are uncaring or unable to take them to places where they can socialize in-person. Every kid goes to school, but maybe the kids at school bully them, or maybe the school is too focused on coursework and doesn't dedicate enough time for socialization, or maybe the kid is home-schooled. Especially if a ban were enacted today, some kids spent most of their life on social media, so they might have trouble adapting and socializing in-person.

Personally, I think the most likely and best solution is better social media. Currently, social media is regulated to shield kids from explicit content and predators, but it should also be regulated to shield them from negativity and mindless engagement, and to promote positivity and healthy behaviors (including not spending too much time on it). Recommendation algorithms for kids should be strictly controlled by the government; keep in mind that the government already strictly controls what kids learn in school, and it doesn't have to outright ban "non-explicit harmful" content, just down-weight it enough that kids don't find it without intentionally looking. Plus, a social media with healthier recommendations and discourse may become popular for adults as well, even though they wouldn't be locked into this version like minors (I can imagine a system that requires consent like adult ID but then lets adults stay anonymous, which could be bypassed by dedicated minors, but most wouldn't care enough to do so).