If you're worried about price there's not much difference in MPG between E10 and E30. BTW, the EPA is trying to push for E30 as an alternative to Premium which IMHO is a much better solution than the E15 crap being pushed by the RFA:
http://www.nytimes.com/2013/05/05/au...nol.html?_r=1& It's never going to pass the current Congress though. There's just no way.
Besides more power, Premium allows for more fuel efficient engines. So this could encourage more efficient engines. Competing against premium would give Ethanol an advantage price wise and finally provide a niche for higher Ethanol blends. But this is at least 5-10 years before this plan could happen. At this point none of the flexfuel cars take advantage of higher blends of Ethanol, they make only marginally more power due to tuning.
They're going to wish they passed the Flexfuel mandate back when support was high. We wouldn't have near the FUD if all new cars were flexfuel. I've no doubt that the E15 fiasco hurt the EPA's credibility and they ran the most testing they've ever done. Plus they alienated many car makers.