Perhaps remarkably for such a big band, my 12/13-piece party bunch has had a very stable lineup in the 15+ years I've been with them. We've had a tiny turnover of members in that time, mainly due to either availability issues or maternity and, sadly, one passing-away. We're all being sensible about getting together again, luckily our 'rehearsal space' (village hall) is big enough that we can all get in there and still socially-distance.
There's been no turnover in my other band but then I've only been with them for a couple of years. One member is starting to get a bit frustrating if I'm honest though, keeps putting obstacles up in the way of us gigging again -- first it was covid-related, now there's an added refusal to do anything that doesn't pay well. The rest of us are quite happy to do our part to help rescue the beleaguered hospitality/ents sector by playing one or two gigs for expenses only for the first few months to help places get back on their feet, but this member is dead against it. I'm reluctant to suggest replacing this person with a dep for the few gigs they don't want to do, but I'm wary of said person getting a cob on with me -- I don't think it'd take much TBH, I already get an impression that I'm not their favourite person anyway.