1. ZCash at launch will have a whole host of competitors (that actually have users, infrastructure built, etc).
2. With the founders reward of 10%, having this be globally accepted and no less a replacement for Bitcoin is ridiculous.
3. Clones. This is a certainty. (If at all people even deem this coin worthy to copy).

Sure, total anonymity is preferred by some and one could say has a niche market. What's wrong with Monero here? ZCash will be a cluster fuck of epic proportions, and anyone that invests in it early on, will be looking to dump the f*** out of it at a slightly higher price. Bag holders, come grab some ZCash.