I cant wait to get rid of intermediaries and go full p2p, the problem is... how do you avoid the other person running with the coins/whatever you are trading the coins for?
It's based around escrow and reputation. Buyers and sellers agree on who will arbitrate. It's an amazing idea but it'll need a huge amount of streamlining before it could ever take off properly. It's one hard sell on top of another hard sell.
Maybe places that really need it will lead the way.