I'm afraid you've been absorbing more propaganda than facts. For starters, ethanol in any proportion is banned from petroleum product pipelines for sound safety reasons, to prevent leaking seals and other problems.
As for gas stations, the retail fuel market in the US is overwhelmingly made up of independent businesses. Those carrying a major company brand either have a supply agreement with that company or with a distributor representing that company in a given area. Very few stations are now owned and operated by major oil companies. The reason for that is that it is a low-margin, low return-on-capital business.
Talk to most retailers and they will tell you they make more selling c-store items than fuel--much more. So why should they invest large amounts of their own money to put in additional pumps and tanks to sell products for which demand is small? To make even less money selling fuel than they already do? If you're looking for a "lockout" it's that the business proposition of adding these fuels--especially E15 that no one is begging for--is poor. I am not opposed to expanding opportunities for people to choose alternative fuels. However, if ethanol producers and their trade association want to see these products in more stations, perhaps they should consider investing their own money to issue grants and loans to assist retailers to do so.