another fundamental question is wether Bitcoin can replace normal currencies and that again is not feasible in the nearest future.
Of course its not feasible, a countries pride is also indicated in their money system no country would replace their pride over a digital currency.
Why then should people invest in or buy a currency that can rise or fall by 20 percent in an hour or two?
They want to take the risk of gaining more since you can earn 20% more in just a couple of hours, you cant do this in normal trading this is why crypto traders are taking such risk for this kind of profit.