It all bumps over (and I’m sure you know that). Farmers that have a choice as to which crop move towards corn (any type) if there’s a greater demand there. It all (essentially) coming from the same amount of land...although, eventually, market forces should bring the supply up (assuming that we don’t go to 15% ethanol first).
Corn acrerage for the last 20 years. It's went up around 12% from the average.
Soybean acreage however is way up...
Which accounts for the loss in wheat but soy isn't used for ethanol. Increased acreage in corn and beans together pretty much offset losses in cotton and sorghum acreage as well as wheat. Cotton isn't food, sorghum is raised for sweetener and not food.
However, wheat production is about at the average of the 20 year production line. Losses of acreages attributable to soybeans than corn hasn't affected our wheat output. What's going on in Egypt has nothing to do with ethanol.