Funny thing: In Europe this is more or less standard. You can rent a grave for 35 to 50 years, then it gets repurposed. You know the classic setting of horror films crypts filled with bones? They actually exist, because that is something that has gone on for a very long time in europe. People get buried, then after a few decades, they get dug up, their bones are piled in these crypts, and a new person is buried in the now empty grave.
I think this is an european thing, as we don't have so much unlimited space.
Still, OPs idea is kinda ridiculous, as you don't do this in the US because there is enough space in the first place.