Some of my cousins/colleagues used to be active but now they have got fed up of FB.
Amusingly, none of them ditched FB because 'Oh FB is evil mass surveillance system'. What I sense is people are getting fed up with FB.
Sadly, it is Whatsapp which has taken the place of FB.
I see it differently. Looking at it from a stats perspective, people who just login and don't scroll are also pretty valuable for Facebook since they're still come under the DAU and MAU numbers. They're counted for the ad impressions, and subsequently ad revenue.
Even though Facebook has prioritized friends' posts, bulk of the content (even though it can be not the most important) I think for most people is by pages and companies. Who I don't think are going to change in any way after this event.
It's still a great communication tool without the users who post though.