As churches see less membership, at some point congregations merge and one church is shut down.
Many churches do outreach and provide services to the community, the poor, and the homeless. This often includes shelter from the elements, soup kitchens, food pantries, meeting places for groups like AA/NA/etc.
When a church shuts down, the distance that the population has to travel can increase, and there might not be enough room to provide the same resources to those populations.
Additionally, it's not necessarily a problem, but more of a musing... What happens to all those old churches? The impact on the property market has to have local effects...
I wonder how many churches are shut down, but are just maintained by a skeleton crew of maintenance people in the hope that their customer base will increase enough one day to restart their services and reopen the property.
I assume churches don't pay property tax, so as long as the church is in hibernation mode and not actually totally dissolved, could they hold onto the property indefinitely for just the cost of maintenance? Or would them not providing religious services anymore cause them to lose the exemption?