I'm not sure I follow your point about governance design. The Zcash core devs all work for a company Zcash Co with a clear leader Zooko and it's reasonable to expect them to move quickly, much more like Ethereum than Bitcoin. I think there are lots of questions about the viability of Zcash but I don't think governance is one of them.
RE: The latest experiment in tech, economics, and psychology: Zcash