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Actual research shows the opposite effect on mental health from what you are saying. When you don't have Facebook your friends and family just txt or email. I mean Facebook book hasn't even been around that long. To pretend it is something like water or electricity is just preposterous.
While I agree that FB disappearing wouldn't be that big a deal, the idea that email is an "obvious" alternative is quite problematic for the younger folk. Data point: In 2009, the admin assistant in my department at university told me she's been getting quite a few upset incoming freshmen because of the requirement to have an email address for university classes - many of them had never used email before, and had com…
Also, I'm surprised the university wasn't assigning them .edu emails anyway. My younger brother is in college now and he loves the school email for getting student discounts.