If Facebook does so, it will not impact me much as i am not a keen user of Facebook, neither I am running any business activity there, though I would loss some of my old contacts which is bad.
It would be a great loss if LinkedIn deletes my account, as that would cost me the loss of some important contacts.
According to me, today Facebook has lost its charm among youth, many prefer to be on Instagram, Snapchat , etc. Facebook is more important for people who are in age group of 25-50 years and also to people who wants to advertise their products on it.
It is also seem that uploading media(video) on Facebook will generate more views then as compared to Youtube too.
so as your question, if someday facebook deletes my account it doesn't matter much