There will be many crypto-currencies 5 years from now and certainly the ones that work best will have the widest adoption.  A currency which maintains some stability day to day will win over one that fluctuates so wildly.  Even in my own personal experience selling bitcoin to an individual who was trying to actually use them (he wouldn't say what for) ... but his request to me was to offer the coins to him at a fixed rate.  The daily fluctuations in price messed up his business model when prices would change before he could complete the whole cycle of a deal.