Cryptocurrency has already succeeded and there is no point doubting if it will succeed or not. The market is down, that does not mean crypto has not succeeded.
Yes cryptocurrency is already an successful online currency and in near future their are more possibilities that it will be more successful. Many online retailers and shopping sites are also use it as a payment option for their customers. It also use it for investment purposes because of its increasing market price. And its has a profitable investment history too. And it also use for many national and international transaction. These thing makes it succeed in the future with no doubt.