The way I understand you (which might be off quite a bit), the natural candidates for that kind of service would not be Amazon or Ebay, it would be insurance companies. "Sorry, I can't do business with you, seems like my conflict resolution provider does not have a peering point with yours" might be part of a perfectly reasonable conversation some day.

But are we still looking at problems solved by a blockchain or are we already looking at problems caused by it? Honestly, I think I've lost track at some point.