This issue is mentioned in a small sub-comment and has drawn no replies but it seems to me like the Heffalump In the Room:

"For its first four years online, a portion of every mined Zcash coin will go directly to Wilcox’s Zcash company and a smaller portion to a non-profit he’s creating to oversee the Zcash code and community longterm. Wilcox says that he plans for 1 percent of Zcash’s currency to ultimately go towards that non-profit, and 10 percent to be paid to the for-profit startup."

Who is going to want to engage in commerce in a system that creams off a 10 percent vigorish on every transaction? Credit card companies are hated by small merchants for taking a third that much.