Early to predict the future of cryptocurrencies for the medium term (5 to 10 years) as it can't really replace FIAT money or to be fully adopted as well. Everybody knows how this conflicts with financial institutions that govern our planet.
However, the concept of a blockchain is also seen as a potential revolutionary way to create a more than just a society based on open platforms and open decentralized data. However, the reasons of why cryptocuurrencies is actually a disruption to existing solutions varies widely.
This academic researche result may provide a lot of answer on what is the situation of cryptocurencies: https://scholar.google.com/scholar?q=future+of+cryptocurrencies&hl=fr&as_sdt=0&as_vis=1&oi=scholart