I don’t know if there has been any attempt to gather data about the overall state of choral singing since covid, but all the anecdotal information I’m coming across suggests that choirs are mostly back up and going, but depleted. A few groups didn’t make it through and disbanded – not necessarily directly because of the pandemic, but the stresses of the situation brought underlying problems to breaking point. A few groups, meanwhile, have come back with increased numbers and are facing the enviable challenge of integrating a high proportion of new singers all at once.
Most, however, seem to be reporting a drop in numbers of about 30% from pre-covid levels. The first ones lost were those who opted out during the zoom era, either finding the whole online rehearsing thing presented too many obstacles for them, or dropping out after a while because they found the experience unsatisfactory. Some of these singers have come back on return to live singing, but not all.