I was a big fan of google+. whenever a story of its impending death came out five or six years ago, the community ignored it and pointed to whatever signs that things were fine. It hobbled along for the next five years and never died but slowly faded away. After a while I stopped logging in, not all at once but gradually reducing. If Facebook is going to die, it will be like this. Slowly reducing over time. Most people won’t dramatically quit but will find themselves logging in less and then not logging in. I think that reduced use has been a trend for many users this year, but that could be my bias.