I think the drop in volumes is not only in icon, the volumes are falling in all coins in all markets. Perhaps this is due to the summer season and many people go on vacation, relax. And maybe it is connected with the centralized exchanges, where regulators are already looking for trading volume. Now the reasons can be found several, but it is clear to all that the volume is really falling.
Yeah i understand the whole markets exchange volume is down but it doesnt explain why ICX never was even a top10 by volume for example when it opened on Bithumb. There just doesnt seem to be that much interest in this coin in Korea, or atleast not as much as us westerners seem to think.