Social distancing will taper away, whether officially or just by people gradually ignoring them.
I do hope, though, that there's greater respect in the long term for those who want to keep their distance for whatever reason, i.e. whether they still fear Covid or whether they just don't like personal contact.
Things like handshakes may never return to the norm, and huge numbers of people will be thankful for that. Likewise hugging/kissing people you hardly know just because it's the done thing. That kind of completely unnecessary contact can go the way of the Dodo - if people want to do it, fair enough, but let's make it socially acceptable to say no, rather than being forced to look strange.
Likewise, hopefully people will keep their distance in queues, shops, busy places, etc - really no need for others to be so close they're touching you when you're just buying tins of beans.
Maybe even more acceptance of people who want to wear a mask for whatever reason. Even as Covid was starting, a woman in our town was punched and kicked by a random stranger for wearing a mask - that kind of stupid behaviour must never return.