Cryptocurrencies will continue to be relevant. The way Facebook unified and connected the world via social media, cryptocurrencies will be used to melt the frictions that arise from nation states. WE ARE at 1992 of the Internet revolution but with money.
That being said: the 90s were dominated by Netscape, Yahoo, and AOL. 20 years later and Yahoo is the only one really still holding on (and honestly Im not sure if I would take them or Macys as the company most likely to implode in the next 24 months).
Bitcoin, BCH, Ethereum, Ripple, Dash, Monero.
Atari, Commodore, Nintendo, Sega, Intellivision.
You dont know which one will come out on top, but there is no way in hell the technology is not disruptive enough for one of them to evolve and dominate.