We just had two new members join our club, but then we're not shut, just our hut, for obvious reasons. The club is perfectly active, and when members have been legally able to cave, then some have - we just can't organise 'club trips' or use the building in mixed groups without breaking one or more regulations at the present time. There's plenty of other things caving clubs can do apart from actually caving - renovating the hut, for example, or getting all those surveys completed that normally wouldn't be - and all the photography, fieldwork and lead-checking that can be done. I've done all three and more with other club members, and had a great time, like we usually do - we just weren't underground for some of it.
I can't think of many organised activities that are doing much better than caving at the moment, and we do have the benefit of long-term usage of our chosen facilities - way beyond pandemic durations, and indeed our lifetimes. Unless a dig is very, very unstable (like one of ours is), chances are the place will be exactly the same as it was before lockdown. My concern is that some people don't seem able to consider doing anything with their spare time other than going caving.