The big issues with ethanol are acerage for production, problems with transport (picks up water easily) and the debatable "fact" that it likely consumers more energy in production and transportation than it provides in return.
Having said that, ADM got a huge ethanol mandate pushed through with a lot of additional tax incentives for carrying the product (and people cry about welfare mothers - BOHICA

). Marketers located near supplies are excited because they get a piece of the subsidy now

. It's been a blizzard of press releases in the past 12 months with all sorts of conferences, etc.
Functionally, supply (and base cost) and logistics are the real limiters with ethanol, as well as consumer education. Ethanol had a bad rep in the 1970s, and even people with flex fuel vehicles typically don't know they drive them. E85 can be a great thing ($) for a consumer if you live in the right place and drive the right truck or car (plenty actually on the road today). Though actually, you're just getting a percentage of the tax you gave away back in a lower fuel price. Strong interest in the Midwest today for sure, and as Toad said, with crude and wholesale gasoline where they are now... some actual margin on fuel products for a change at the retailer and marketer levels.
My gut take... a fuel that both overseas and in the US is more subsidy/artificial support driven than naturally driven. Good for octane boosting though.
Charon