In My opinion the future of virtual currency is only bitcoin. I do not think such good digital currency will come in the future. Bitcoin future is assures also when we see their are lots of people joining in. In the future you will just carry a phone and all things you need is in there.
After seeing the current fluctuations in the price I am also sure that the future of crypto will be only bitcoin because the price of all other coins when start to drop then drop too much that a person becomes poor while the price of bitcoin do not drop much when the price start to increase and the value when start to increase then bitcoin increases much faster than any other coin. It means that the trust on bitcoin is much higher than on any other altcoin.