The problem is that in many of those places where enough water naturally falls from the sky the soil and/or the weather isn't as good for growing food.
It is generally much easier to move water to a low water place that has great soil and/or weather than it is to move soil or weather to a high water place that is missing good soil or weather, and so here we are.
Then economics, lack of infrastructure and incentives buried it in a few years. Farmers were left holding the bag. Many were not happy they had made a huge move into this new "renewable" energy, only to get burned in the end. The same farmers I know have scoffed at windmills and solar farms.
E-85 really lost a lot of farmers willing to use their land for something that won't pan out. The ones I know went back to growing what sells and grows the best in the market. Trying to tell a farmer that solar panels on his land where he grows food to feed his family is going to be a tough sell now.