I mean, this is the entire intent. It lowers your resale value quite a lot too though, since it's not open for development.

I was moderately interested in a property in the middle of nowhere that had about 8 acres buildable (with two structures on it already) and about 220 acres of forest and a lake under a very strict conservation easement. It would have been the only property of that size and type I could even dream of affording. It was still expensive, but less than a million dollars where if that 230 acres had not been under conservation easement in the same area it'd have sold for over 10.

And it's not like indefinite means forever forever. If the next generation 4 generations from now decides these easements are not in their best interest they will be repealed. It's just a piece of paper in the end.