They haven't stopped swimming because of some better alternative. They stopped swimming because swimming conditions have changed and now it is a bad idea.
This story is directly analogous to the scenario described in the comment that started this entire sub-thread: https://news.ycombinator.com/item?id=23743161
If section 230 is repealed and social media becomes too toxic for most people to use, of course people would not stop communicating. The vast majority of human communication doesn't even occur on social media.
> to get rid of social media forever regardless of the other consequences
0: 103% of statistics on the internet are made up.
1: 2+49+245049.
That's assuming the spammers can't figure out how to effectively troll the people who came for the rage bait into propagating their spam, but they can, because spammers are Turing-complete.
Obviously the people who came for the legitimate content will be destroyed. Or take up spamming.