Segwit is only going to activate on bitcoin not all coins. It shouldn't be misunderstand with Aug 1 events. Segwit ain't going to come now, the possible segwit fork will be coming in few months. Currently you need not worry much about exchanges. They will be close for one or two days to see to bcc fork after that market will regain its momentum. As trader, you can be assured that prices of coins not going to change much.