The future of cryptocurrencies depends solely on the cryptos themselves, if the tech and algorithm isn't a good one then it obviously won't stand the test of time.
I think the future of bitcoin will depend to people who have trust on it or the people who invested on bitcoin. Furthermore, most of the people believes that bitcoin and all cryptocurrencies will have great future and I also believe to that because they to continue to develop it. Lastly, I think in the near future cryptocurrency will become one of our money.