We simply can't produce enough corn to make ethanol any sort of primary fuel. Right now production capacity is through the roof, but everything will level out. Ultimately the price of oil is going to determine the price of corn (indirectly) and thus will determine the incentive scheme that farmers will use to determine whether or not to re-enroll in CRP. Also, it is important to remember that Congress will be working on a new Farm Bill this year. With Democrats in control, I'd say it is highly likely that more money will be spent on conservation programs. Bush/USDA has proposed its own version of the farm bill with increased spending on conservation as well.

Someone already mentioned it, but farming is not going to be the downfall of wildlife populations and hunting. Development and increasing populations are more likely to hinder our opportunities as sportsmen.