Perhaps I was too willing to look at things as set in stone when I put forth my argument. The way I see it (which echoes what someone else — maybe you? — said in a different thread), if they're only thinking about changing things now, after such a massive and extensively-publicized cock-up, things are already too bad. I don't think there's coming back from that. Even if Facebook is revived, they aren't going to be the same thing they used to be... right? Then I look at Reddit. I'd read the comment section on every one of the big, publicized Reddit derbies (remember "chairman Pao" and the Ellen Pao-Hitler memes?), where people swore off the platform en masse. 2+ years later, and Reddit's still alive and kicking. Voat's been getting enough of a sunlight that I occasionally see GIFs watermarked with the... whatever Voat's subreddit equivalent are, but it's not nearly as big (and, as Wikipedia says, full of alt-right member et al.). So, the way I (so narrowly) see it: what does Reddit have that led to it staying afloat, and does Facebook have the same quality to it? (I remember reading about how Facebook is very important in South-East Asia (Phillipines?) because for many people it's the only way to keep in touch with their families back home when they leave to other countries to look for work. That seems like a decent factor for it to stay afloat)it's whether or not Facebook is agile enough to change.
Someone somewhere (mighta been Twitter) that Facebook is a monopoly. It's not, though. It just happens to be the only social network anybody bothers with. Once upon a time Digg was the only aggregator anybody bothered with. Then they decided to monetize and they were dead within two weeks. Everybody bolted for Reddit and never turned back. Of course, traffic was higher-quality back then and people had better taste and the only people bothering with aggregators were computer nerds but the point remains: Reddit makes no money but is worth $1.8 billion. Put that in your pipe and smoke it. As soon as they have to make money, they'll have to act like they respect their customers (advertisers) and advertisers will go out of their way to avoid pissing off the people buying their soap. It's my opinion that the horrible stuff Reddit gets away with, they get away with because nobody holds them accountable. As soon as they have to sing for their supper like every other company in the history of mankind, they'll sing a different tune.