What Happens to a Lot When the Last Sim Dies?

I’m currently playing a household with two sims who are almost elders and don’t have kids within the household. What will happen when they both die? Is it safe to move someone else in to transfer the second gravestone to the graveyard? Could I just bulldoze the lot? I know that deleting gravestones can cause corruption, so I need to know what a safe solution would be to manage the leftover grave.