I think deleting it completely is a bit extreme, there are alternatives like the privacy options suggested earlier or removing pretty much all content etc..
I guess back in the day there were people who didn't want one of those telephone things in their house or others who didn't want a TV (probably still some people out there like that today).
I was in a play a couple of years ago and the standard thing to do was to set up a private Facebook group for co-ordinating everything relating to it... then one guy pipes up:
"Erm, ackchually I don't have any social media"
that's fair enough I guess but then it turned out his reasons for it were related to all sorts of CT related stuff... it was explained to him that he could just set up a throwaway account (and even use a throwaway e-mail address if he was that paranoid) and delete it after but it still took about two weeks before he stopped being a nob about it, realised he'd not have access to relevant information and finally set one up/joined the group.
I suspect that some of the antisocial media extremists will carry on running into issues if they're unable to use say messenger, Facebook groups, WhatsApp groups etc.. I use messenger pretty frequently these days, have a fair few WhatsApp groups for different groups of friends and other ad-hoc ones are formed for say a wedding, stag do, holiday etc.. I can't really envisage getting rid of that stuff now... likewise re: people who don't even want a phone some jobs now require you to have a phone/be contactable (and indeed some will supply the phone) etc.. I wonder if in future some will require you to have some form of social media access too (some probably do at the moment) in order to be part of a work related group.