To put it plainly, I couldn't muster a single shit if Facebook ceased to exist.
Actually, I'd celebrate. The web can survive without being commercialized. It'd look much different, for sure. That's the point.
Edit: I'm not saying this isn't a super idealized fantasy that will never happen. I'm just saying I'd partake in that fantasy.

For people still in their working days, I'd agree with you. Every 30 year old really should know how to use a computer at an at least basic level.
My grandparents, however, have had a life full of working for a world that wanted to give them as little as possible. My grandmother wants to relax, and my grandfather wants to keep busy how he wants to work. I think they've earned however they want to live, whether that's with or without learning how to use a computer well. It's really not harming anyone.
I will give my grandma credit, though. She's not resistant to learning how to use her phone—she just doesn't need all of it, and she's not gonna fully understand that which she doesn't need. My grandfather is pretty resistant, though. That's just how he is. The phone is the least of our worries.