> The 20-somethings don't use FB, and sure as hell aren't going to use it for dating, and the 30-somethings probably aren't either.
Facebook has been known (and are starting to) take over their family of apps. Instagram, WhatsApp and Messenger are already used by the 20 somethings and all the founders are gone so they have full control over them.
I wouldn't be surprised that they would shower features into it's family of apps that already exist on FB. (See Stories)