By 2020 virtual currency will be more popular and so altcoins too will be reaching a very big user base than the present. The volume too will be increasing very big for most of the altcoins. Hope bitcoin will be serving as the head as the upcoming halving by the year makes a added demand to bitcoin because of supply reduction.
ya i agree in 2020 cryptocurrencies will be so much more popular than today. and i believe this will followed by society to accept the virtual currency and accepted blockchain system.