This may be a bit off topic, but...
Please read this genealogical website regarding how some other, older, more crowded cultures care for their overcrowded cemetaries.
As a first generation American, I had an interesting time when my aunt from Germany came to visit (in the mid 1970's), and was horrified at the sad condition of some gravesites she saw while passing by a cemetary. My mother, knowing the difference between German and American customs (or realities) stopped in the cemetary and asked her to read the markers. My aunt was amazed at the years on the markers. Her comment was something to the effect of, "No wonder, there is no one left alive who knew this person to care to keep it up".
The time frame that I remember from my mother's and aunt's comments about the turnaround of precious grave space was on the order of 30 years.... the linked to website says 40 years... This reuse of grave space in Germany must go back to at least the turn of the prior century - I wonder how long?
More on topic...
With my very limited caching experience, we had a chance to go past an almost abandoned cemetary - the cache was nearby. I think the CITO concept in this situation was very approproriate. Going through it gave me and my family something to think about in terms of imagining the lives of the people who had been buried there. By CITOing we were also able make the area more beautiful (couldn't do much about broken or tilting headstones), thereby respecting both the dead and the people who at one time wanted to honor them.