edit (too deep to reply): I really don't think it's moving the goal posts, you asked about redirecting that food production in general, not soy. As is mentioned elsewhere, the soy oil isn't really used much for food anyway.

That said - you can't just swap corn grown for ethanol for "corn for people to eat" - the equipment involved to harvest it is completely different, as are the facilities to process it. The same concerns apply to other crops.