BCC shitcoin will get dumped hard. I'll take the free money though 
Agree, people will sell immediately if they get free money from bitcoin branch which named bitcoin cash or maybe they should named it 'bitcoin crash currency'. But I doubt more exchanges will list this coin if they feel it maybe inflict a financial loss, and so far just viabtc announced support BCC. Digital currency price will be determined by its usability, none of altcoins could compare or compete with bitcoin, altcoins will always become trading object including BCC.
You are greatly underestimating the other currencies.
I think it is too early to say that Bitcoin Cash will not have value, many people will not dump their Bitcoin Cash ... people are greedy but many people learned the lesson of the altcoins that had an increase in the price astronomical, so i think many people will not dump their Bitcoin Cash and many exchanges will support Bitcoin Cash in the future.