Couple of things -
As it sits, the forest reserve law is one of the oldest tax laws on the books in the state of Iowa. It has been in existence, with very little alteration, for decades. It is by a wide margin the best forest tax law in the country, and is one of the very few incentives to keep marginal land out of production. Representative Hansen lost his anti-forest reserve law republican co author last fall when Bob Hager of Allamakee county was not reelected. It was hoped that that would get rid of the talk of changing the law. Also, you don't have to look far to find on of the biggest opponents of forest reserve, Farm Bureau. They have consistently lobbied against this, and are quite jealous that forest landowners don't pay taxes on their land, when their farmland is being taxed.
The CRP issue is an interesting one. If the government would have structured it properly in the beginning, they could have just bought the land enrolled, and made it permanent habitat. Some contracts are going on 25 years, and being enrolled for another 10-15. That many years at $100-$200/acre, and you are looking at having paid the appraised price at least once. At a minimum, it should be a permanent easement type program. FYI, they just announced a new general signup to start May 20th.