Not sure if this has been ruled out, and I can't believe no one has suggested this yet - but why can't we use DE for walls? Maybe starting at Town Hall 10, since we have two wall levels, and they are expensive, and so many to upgrade?
Not sure what the conversion ratio would be, but maybe 25,000 DE for a level 10 wall and 50K DE for a level 10 wall or something along those lines.
At least that would give the TH10 and TH11 villages with max heroes something to use their DE for. Sitting on 200,000 DE in your storage day after day gets boring.
SoloZ

