I think a point is being missed. corn ethanol is a gateway biofuel. I don't think any scientist who knows how to multiply would believe that you could supply all the transportation fuels needs via ethanol. the point is that by starting to transition to biofuels, funding will be created to determine which plants produce the highest yields and which combinations of high-yield crops can be rotated, etc.
My vote was on biodiesel/SVO anway. there's less chemical processing involved, hence a higher EROEI.