is the ZEC the new BTC? No. why? because miners are selling their ZEC for BTC.
everybody that really believe that ZEC will have a future and will replace BTC should keep their coins.
Some people will say ZEC will be the another mainly coins like btc. I guess you're right about the miners are selling and trading zec for getting the bitcoin, bitcoin are still strongest than ZEC on my mind and too difficult for zec take over the bitcoin's chair.
but i'm not naive if in this time ZEC are very potential for gaining your profit.