Doubtful. Facebook is not just facebook.com, it's the whole package of FB Messenger, WhatsApp, Instagram, etc. People may uninstall the mobile app and limit their Facebook access to their laptops or desktop computers (that's a popular response among my colleagues), but I don't even know anyone who has actually deleted their account — aside from the folk who never had one, like me.
I also get the impression that usage of Facebook and related services differs greatly from country to country, and from demographic to demographic. This article¹ from 2014 on WhatsApp usage isn't joking; In countries like mine (the Netherlands) not using Facebook-owned WhatsApp (like me) is rather exceptional. If I had kids they would miss out on basically everything (playdates, birthday parties, changes in schedule for sports/scouts/etc.; not to mention becoming social recluses because all their peers (or their parents when they are younger) are on Facebook/Instagram/WhatsApp) if I kept refusing to use Facebook's offerings.
Facebook is not going anywhere soon (although I wish it was).