If your future generations stay in one place long enough, they might need one anyway, or at least an historian. I've made a point of finding old, inactive family burying grounds. There are many. The roads no longer run past quite a few, they're out in the woods now. There are three in my direct paternal line alone, the current, active one and two others, going back to the mid-eighteenth century.
Another, known as "The Big Lot," which always struck me as sounding like it came right out of a Steven King novel, is particularly poignant. So many hardworking Christian people, dutifully buried facing east, but marked with fieldstones. War and economic disruption can take things down to that point quite easily in less than a generation and it takes generations to climb out it would appear, from looking back at those places. The living were so burdened with just feeding themselves and keeping a roof over their heads that the old plots faded from memory.
We've cleared trees, gotten state markers and easements to most of these. Others landed within the bounds of historic sites and parks. You'd think that would mean a measure of care and protection, and in most cases it does. Watch out, though, if the university anthropology departments get involved. You might end up with a skull being used as a mascot in a fraternity house.
Time passes, things change and not all is kept as it properly should be, even if descendants are right there.
There are estimates that 107 billion human beings have lived and died on this earth.
Where are all those skeletal remains?
Astonishing to think that earth has recycled all those human remains - except for the few million whose graves are recorded.
http://www.prb.org/Articles/2002/HowManyPeopleHaveEverLivedonEarth.aspx