I think that memorial plaques are better than cemetaries. You can out one almost anywhere, and it doesn't need eternal maintanence...and doesn't wash out in floods, and doesn't take good space. I would not go dig UP all the old, quaint ones...just stop digging new ones.

(New Orleans had very little places for burials, so you could rent a crypt for 'X' number of years...then a slab was pulled, and the bones dropped down to join others, and the space re-rented)