I think the exchanges as we know them today, they could change to where there's no 3rd party holding your coins. Maybe some kind of "escrow coin" runs on a "proof of trade" concept where the escrow coin miner gets a small percentage of the trade value when buy and sell orders match up, the fee would discourage fake trades and make the escrow coin worth mining. I had the idea a few nights ago. Would a "proof of trade" escrow coin work? Not sure. But I think it could work to where there's no tempting "cryptsy jar" to reach into.