I agree that highly-public social media anything like what we see now wouldn't work anymore.
I don't even necessarily think that we should kill 230, but I don't think you should be able to curate and promote content, and claim strong rights to posted content, and still enjoy its protections. Yes, this means "algorithm-curation" social media with broad public visibility of content and that claims significant ownership of posted content, would be in trouble. I think services like that should struggle to operate that way. Take ownership or don't, none of this pretending to be one thing while doing another stuff. That doesn't mean we have to crack down on web hosts or ISPs or email providers or anything like that, since they're not doing most of that stuff.
The fulfillment of this fantasy of forcing platforms to abandon their efforts will just lead to all of social media degenerating into cesspits as they fill up with porn and swastikas and all normal people leave.