No, what will happen is this. In the event that Bitcoin forks into BTCcore and BTC unlimited. BU will be considered an alt (by default) by exchanges. But if the network moves toward BU and it becomes the longest/strongest/most secure chain, BU will be bitcoin and BTC core will be the alt. Exchanges have ZERO control outside of their "word".

The exchanges lay claim to play god over what is the true Bitcoin? Exchanges have no say and anything they say is only to sway the market in their best interests (higher prices with no fork). It is a manipulation attempt. If they can be heard by the majority (read majority of the money) then they profit. If we fork, BTC tanks, and their profits go down the hole for some time until confidence is restored.