That does not solve anything, since people are drawn to platforms with easy accessible content they enjoy. People will use those platforms. The problem is that algorithms will recommend you radicalizing content. And it’s an extremely complex task to solve. I would have no idea where to beginn, except better education - but that’s something that will take a generation to work out.
If the system is so fucked that it’d “take a generation to work out”, maybe the system isn’t worth saving in the first place. We’re talking social media websites here, not something like hospitals or schools that are required for a functioning society.
It took us hundred thousand years to figure out that hitting children as education is bad. We might not be the brightest.
More serious - sure, but it’s not that it’s easy to get rid of social media. Sure in china you can just forbid them, but they go more the way of using them to spread state propaganda. And in most democracies, people won’t support a blanket ban - I wouldn’t.
You could outlaw for-profit participation in the sector. Facebook would suck way less if it didn’t have to increase profits for shareholders constantly.
That would be a marvelous solution for sure (if we manage to close loopholes), but you will need one hell of a salesmen to sell it to general population.