As cryptocurrency is already being used in as a payment method, do you guys think it can replace cash in coming future?
I think yes, cryptocurrencies can replace fiat money in the future although it will not happen soon but as we know we are in digital era where all of the people have smart phone and access to internet easy, the addoption of cryptocurrencies to be used for payment method daily in the real life is just about the time until it happening.
You are right mate. There is no doubt that it is going to replace gradually. Many countries have chosen blockchain technology to accept cryptocurrency is the medium of secure payment. So, the future will be cashless. We will do transaction virtually. 
When we will be able to do transactions virtually, it will be a new stage of mankind developement

Like was internet before.
It will be possible to do your business via blockchain, to do your living via blockchain, eliminating the factor that you were forced to interact with people offline for making business
