I think Dash, ZenCash(Horizen) , Monero will stick around and only get stronger over time. These coins have teams that are trying to jump the divide between being a financial instrument purely traded among enthusiasts to one that has utility that can purchase real world items. I also believe that what will help Alt-coins or Bitcoin for that matter is countries who have mismanaged their economies like Venezuela or Zimbabwe crypto in these places has quickly become the only thing that is real and the government cant get their hands on easily.