Counterpoint: users already have moved away, and that's why advertisers are able to do this without hesitation now. FB is still growing in the third world, but I don't know a single person in the US under 30 that still uses it.
On the other side, I see Instagram doing fantastic among my friends, and it gets way less hate from them, despite being very openly owned by Facebook (it says it on the splash screen).
You laugh now ... you can buy me a drink in 10 years or so.
Why do you speculate that? Specifically, do you see signs of changes that could likely lead to that outcome?
1) the amount of sharing we already do. 20 years ago my family / social interactions would find it nearly impossible to even bother entertaining the current status of privacy. The idea you basically HAVE to have a cell phone and email to get any decent paying job, traffic cameras everywhere, and now corporations pushing their black box ML and hardware into municipalities / vetting with police support
2) volunteering approx EVERY biometric a person has to skip a line at airport screening (Clear, the company facilitating this)
3) political adversity to privacy and encryption
4) hacker news. Where I hope and aspire to participate in the best most curious and supportive manner. I held the conversations here in high regard and told outsiders of how productive and intelligent the conversations are (they are). Yet I frequently find many downvotes when I comment in opposition to Facebook, slightly less common re google etc.
5) in takeaway I have observed cultural changes, market, political and security practices changing... all in a direction of - whatever this possible, seems not good, and seems highly unlikely but valuable to entities in power - might actually happen.
Thanks!