is there a any chance z cash can cheaper than today price within 2 month due to volume increase
Since its beginning ZEC is only going down as far as I know. There are no signs it will go up in the future, but the the price is falling not because the volume is increasing. It is falling because it was set too high for this coin in the beginning of November 2016 when it was first put out to tender.
i think by volume he doesn't mean trade volume but instead the amount of new coins that miners are earning and dumping and that is not changed and is still big.
and about the price i have to say this is another one of those coins with high price and not much to offer, and in the long run it will continue going down.