I agree essential is too strong, but I think the danger is not "what if they go away", but the fact of (nearly) everybody using them is a problem when that's selectively denied.
E.g. a sibling comment mentions Facebook pages for small businesses: if Facebook went away or stopped offering them generally, that would fix itself within less than two weeks. If the vast majority assumes they can find all businesses on Facebook, but yours isn't because Facebook doesn't like your name or some aspect of your business, that's a long-term issue.
E.g. a sibling comment mentions Facebook pages for small businesses: if Facebook went away or stopped offering them generally, that would fix itself within less than two weeks. If the vast majority assumes they can find all businesses on Facebook, but yours isn't because Facebook doesn't like your name or some aspect of your business, that's a long-term issue.