As far as a lawsuit goes, as long as they provide the current 10% at the pumps (or even non blended fuel), that leaves the choice up to the user to decide what they put in thir vehicle. That will probably not happen, but... if it would, that would reduce many issues.
Now, growing up in a farming community, ethanol isn't bad, BUT it does take as much $$ (or slightly more) to produce a gallon of ethanol as it does for a gallon a regular gasoline, and yes, you will have a reduced HP output (and MPG), but a slight amount. If you are running E85, I believe the average MPG is reduced by 20%, so E15 should be less than a 5% difference. But it can add up to be a substantial amount, I will give you that. Ethanol has reduced emissions, but also reduced performance. There is a dispute about energy in ='s energy out.. and that isn't good if it takes as much energy to create a gallon of ethanol as the output of a gallon of ethanol. If that is the case, then you have basically spent a bunch of time and $$ to transfer energy into a usable form. Ethanol blends haven't been around for all that long, so there are going to be new ways to refine the making of ethanol, so lets not be so quick to discard it.... look at drag racing. There are many alcohol users out there for the power it has, for the cooling capabilities, and the more alcohol, the less emissions (though I doubt there are many racers concerned about emissions).
I will say there are many vehicles out there that aren't suited for ethanol, and that is why there should be regular and blended fuels available (now the price can be what ever the suppliers set) If you have an old car and it can't use an ethanol blend, and the non-ethanol fuels are more expensive, then that may be the price you pay to have an older vehicle.
And as far as the comment about us burning food, yes we do, but it is all relative. And if I was seeing kids die of starvation maybe that should be a sign NOT to procreate.
All I'm saying is we shouldn't count ethanol out quite yet. As other people have commented, there are a bunch of groups out there that try to sell it for more than it is, but I think it is too soon to throw this idea away.
Jeff