Sorry for late reply on your post but please can you explain me, even if it happened and bitcoin get hacked, why will only exchangers be attacked and how it won't affect bitcoin? In idea, bitcoin gets hacked so it will affect bitcoin of course, can't understand what you wanted to say when you were posting it. It's like hack bitcointalk but only yobit users will be damaged (sounds very far from logic).
P.S please don't open new thread about supercomputer and it's ability to mine all coin and hack all wallet, forget that. Currently it's not possible to "hack" bitcoin, but virtually everything is possible.