There can be different "beliefs" in cryptocurrency. For instance, some may think cryptocurrency will take over and destroy all fiats. Some may think cryptocurrency is short-lived and will die off once there's enough regulation to detract users. On the other hand, I think it's somewhere in between where cryptocurrency will continue to grow and develop into a meaningful currency but not necessarily destroy fiat. The most likely scenario, at the least for the "shorter" long-term is that the governments will adopt a form of cryptocurrency (which is already happening) and it will become the new fiat. This obviously defeats the purpose of the main ideology behind cryptoocurrency which is decentralization. I personally believe in cryptocurrency but think we are a long ways off before the true decentralized form of currency becomes the norm. The future is definitely bright for the crypto world though.