I think this pretty much covers it. DVC units are "owned" by the deed holders, so to remove a building they'd have to buy back all the contracts that have an ownership stake in that building, or else build a new building of the same size/number of rooms and somehow figure out how to transfer those contracts to the new building. It all sounds like a lot of paperwork and legal mess that doesn't seem to be worth the headaches that would inevitably ensue - Those contracts would then own a newer building, so then member fees could be affected, which would anger the other owners, leading to lawsuits, etc.