It is still too early to say what happens but one thing is for sure. Bitcoin will spearhead the cashless revolution. Best case scenario is bitcoin as the sole currency around the globe and fiat will be a thing of the past, there will be a lot of studies and political maneuvers in order for this idyllic scenario to happen but this will my best case scenario. Worst case is total ban all around the world and overall price depreciation, the old and broken system will prevail. I do believe that we are arriving at the best case scenario because it has been a decade since bitcoin's inception and I think that is enough traction towards an idyllic scenario.