I go to church every Sunday. The church is its people not its buildings.
I practice christianity rather than churchanity. I worship a living God rather than a pile of stones/ bricks. I believe that the burden of maintaining a large number of virtually unused church buildings is not the purpose fo the church. I would rather the money on the collection place go to help people rather than maintain buildings.
Our church is part of a benifence of four churches. There are only two full time priests for four churches. The churches are reliant on retired priests to have services at all four churches on a sunday. With attendence windling it seems silly to have four services with a handful of people at each church. There is also an issue that none of the churches attract enough children to run decent children's activities.
"Have you considered all the burials? What would you do with all those corpses?"
Many churches have long cleared their graveyards. It is not an in surmontable problem.
"What about listed building status/conservation areas?"
I don't think that is the Church's problem. Christianity is not about maintaining pretty buildings.
"How would you get planning consent for the change of use?
Who would pay to maintain and repair these complex and expensive buildings? All those tall roofs, buttresses, clocktowers and steeples - think of the cost of scaffoling at that height for even the simplest of repairs."
Who ever chooses to buy them.
"What about the archaeology. Some churches have been in continuous use for hundreds of years, and since our very earliest churches were built on ancient pagan sites of worship some churches are sitting on thousands of years of archaeology. Who would pay for that to be assessed? "
Again, that is not a problem that christianity is concerned with.