If that kind of fear is a problem for people, it will just be reflected in lower market prices for land.

Someone who has more of a fear for can put up her self-declared land value. They'll pay a bit more in recurring tax, but would get a significant windfall, if their fear were to come to pass: Yes, there might be some psychological downsides to moving, but getting a extra few million dollars (or whatever) has psychological upsides, too.