Got an idea after all problems that MtGox often have because of DDOS and huge amounts of order.
Why do we rely on a Server-Client Exchange (MtGox) when the strength of Bitcoin is in decentralization???
We should outsource the exchange to a P2P blockchain and let MtGox only handle the fiat and the client-contact.
If we create an open source exchange platform that is decentralized and inspired by bitcoin it would benefit both brokers and clients.

Benefits of a P2P-exchange
-One orderbook: regardless of what broker you use you orders would end up in the same order book. That creates higher liquidity and better execution of orders when all orders in the markets re in the same exchange.

-Harder to attack: If the orderbook is decentralized like the bitcoin blockchain it is almost impossible to attack it with DDOS or manipulate the orderbook. The attackers might shut down the brokers' sites but they cant shut down the exchange itself, all orders in the order book will be processed even if no broker site is working.

-More stable. Decentralized exchange means huge computer power combined and fast execution and it can handle huge quantities of clients without problem.

Instead of rewarding the miners with new coins, the rewards can be based on a percent fee (0,001%) of the bitcoin value handled for each transaction.
It might be possible to build the exchange functionality side-by-side with the existing bitcoin software so all miners automatically also can handle the exchange.
But the blockchain should be separated.

Any ideas and suggestions?