Befuddles me as to why anyone would sell the soul of the property w/ an easement of "in perpetuity". An easement in most cases de-values property significantly.
I think in some places, what you state is the case. If the land is production-based land with not too much in the way of recreation values, there is little conservation easement value to be obtained, relative to the impacts such easement would have on the property value.
Having helped hundreds of clients in the part of the state where ranches sell based on views and fishing, we have found that conservation easements do very little to impact property values. Amenity buyers are not going to sub-divide, or mine, or ...... so those rights have been stripped from the property via a conservation easement has little to no impact on eventual re-sale value. (Don't tell the IRS that, as the appraisal system they require us to use does result in large value dimunition and thus large tax benefits, even if real life evidence shows otherwise.)
We also find that properties in areas that have a high percentage of land in conservation easements sell for more than properties in areas without a lot of conservation easements. Part of that may be the attractiveness of the location, but a big part of it is that people are more inclined to pay a higher price for a property if they know their neighbors have donated/sold their development rights and in doing so, eliminate the concern that two years after buying their dream ranch, the buyer wakes up one morning to find out his dream ranch is now going to be surrounded another ranchette subdivision.
Conservation easements are nothing more than taking one of the many rights associated with real property, whether access rights, development rights, mineral rights, logging rights, grazing rights, and exchanging them via a sale/gift/donation. Anyone who would restriction how people can do that is a closet Communist, plain and simple.
There will be some legislators who see Senator Brenden's bill and will try to use it to force their Tea Party/Communist views upon the rest of us, via this piece of legislation. As much as the Senator loves to grill me when I am in front of his committees, I would gladly work with him to see that his goal gets accomplished, so long as he will fight the Tea Bag Communists from using his bill to steal property rights from landowners by restricting what landowners can do with those rights via easements.