Now that more and more countries are starting to go cashless (
http://www.bbc.com/capital/story/20180427-does-a-cashless-society-benefit-everyone), is it possible that we also start converting to cryptocurrency? If that happens, what do you think are the advantages and disadvantages? Paying virtually is very convenient for me as I do not have to bring cash and it prevents petty theft but what is the disadvantage?
It's not likely to replace the actual cash or currency, but it would coexist within the economic frame. It's still convenient, for some, to use just cash and others prefer online payments.
Difficult for a government to adopt cryptocurrency due to its decentralization, besides, some cryptos fluctuates a lot. Although we would argue that by promoting adoption this fluctuation can be greatly countered.
Having said this, cryptocurrencies and blockchain can be applied as an alternative option for payments, exchanges, remittance, etc., this would eventually lead to mass adoption but without completely replacing it.