I am going to say that Monero is gonna hit $1Bn landmark before ETC does. Starting to get a sense that Monero may continue to have some relevance even beyond Z-cash launching. Privacy is hot.
I also have the feeling that Monero would somehow hit that mark due to people flocking around and getting deeper into the said coin. Too many contenders in terms of privacy, though, and I can't say whether XMR would come out as the winner in this privacy contest between different hot coins (ETH, Z-cash, name it).
For the other stuff.. whatever privacy oriented coin has the highest market cap the more use cases it unlocks or at least on a larger scale e.g when it is $20 million market cap and somebody wants to store $1 million it is unlikely they pick that coin but as a privacy oriented coin grows above and beyond that market cap eventually it will make sense for somebody to store $1 million in it.