The future of bitcoin will stand cause the technology behind it is a technology that is for the future. The current drop in the price of bitcoin is not a big deal or point for bitcoin to crash out of the line, it is just a point of balance for a new hight in its price. If in few days/weeks of December 2017, the price hit a new and an unbelievable height, then there is no doubt that the past months of the year 2018 will be used for correction in its price. The use and popularity of bitcoin will be increased these year immediately the price recovers from its corrections.
Adopting a digitalised form of payment currently in the world would be a disaster, as countries differ in terms of its economic and technological aspect. Considering the developing countries and underdeveloped countries, they face a problem of having a stable internet connection in order to utilise bitcoin. But you are right in saying that in the future, countries will gradually advance its standing and adopt this kind of system. This would take years in order to fully see it in action but I doubt that bitcoin would just fall-out due to a decrease on its price.
Well, what i am more concerned in bitcoin's future is actually its price and that is based on the demand of the people. Bitcoin's market price went down so deep and my faith of HODLing it have been tested. If bitcoin's dominance will continue through the coming years, i believe it will have a very expensive price even before this year ends.
It is matter of time that we need to have patience to hold back. When the rise starts we all are so happy and forgets about the previous times of crash which happens. In the same way once it rises we will forget this time of long waiting which we need to do due to price crash which has happened.
People constantly change their decisions throughout time. When they see an opportunity on investing that would probably yield them income, they do not hesitate on doing so. With bitcoin, throughout the years people have been neglected its existence on its first operations but the ones who saw its potential are now enjoying from their profits. We just need to patiently wait and enjoy the existence of these cryptocurrencies as it may give us profits larger and faster compared to other investment mechanisms.