Well, there’s not exactly plenty of socializing and activity right now.
My general feeling (which includes my own family's behavior) is that people have returned to hanging out with whoever they used to. They just don't go to restaurants or other social settings to do it.
There aren't "organized" activities, but I see kids out playing on my street every single evening.
Honestly it's refreshing to see kids behaving organically for once instead of their parents shuttling them from one activity to the next.
I suppose the impact probably also depends on age and the number of siblings.
We've got three that are two years apart and preschool aged. They were able to entertain each other pretty well through it all.
I could see it being a much bigger issue for only children or kids that have a bigger age gap between them.