The aggregate rise of cryptocurrency prices has been emaciated for the past several weeks. While I do not believe that cryptos are destined to stagnate or plummet in the long term, I do believe that this is the short-term end to the parabolic rises in crypto prices that we've become accustomed to.
This period of stagnation opens the door to major corrections. Because so many crypto investors decided to invest solely because of these coins' meteoric rise, lots of these coin dilettantes will be spooked by the recent slowdown, and many will exit the market.
Thus, I believe that there's a significant possibility (maybe a 50% chance) that many of the coins will lose as much as 80 or 90% of their value (I know I'm echoing Charlie Lee here).
HOWEVER, while I am bearish in the short term, I am very bullish about the long term. I believe that crypto prices will recover from a crash, and I think that several "winners" will probably be widely adopted as true currencies (not just investment vehicles - for which purpose most coins are currently being used). My money would be on Ripple's XRP, since it has top-notch senior leadership with the ability to negotiate its way into acceptance by major corporations.
In sum, prepare for a wild ride, and possibly deep dives in the short run. Over the next five years, I expect certain coins to rise significantly, to stabilize in value, and to earn common acceptance as a means of exchange.