Rise or fall of the cryptocurrency will depend on the acceptance and usable infrastructure a economy has, to bloom it out. It is farely a new method of payment and shows a great potential to rise. Keeping that in mind the volatility factor always give the hard time for the user to make a concious choice. Future holds the key, I guess.

Directed Acylic Graph or DAG is like the better version of Blockchain. This involves overcomming the problems of the blockchains with better infrustructure.

Better the technology better it is for the cryptocurrency world. In this regard 5G network will definitely be a great help for enabling users and also Dapp developers.

People might want privacy while buying something and might not want anyone to know. It doesn't necessarily have to be for money laundering purposes. For example a person wants to by a condom and he might not want goverment spies to monitor his transaction.