I doubt that cryptocurrencies will I disappear. Technology is moving forward also awareness about crypto among people is rising. The market is bigger and bigger, there is more places and websites where crypto payments are accepted, I think this is just a begging but the time is needed.
I agree that is just a beginning of cryptocurrencies market, there are a lot of altcoins with huge potential, not only the most powerful ones like XRP, EOS or Litecoin but also some less well-known like FuturoCoin or DEX.