Bitcoin achieves a certain value. They are used for shaping many economic transactions. People also use this money to invest. And hoarding value. So this currency is now without limits
Prediction is not the real thing about the future price of bitcoin. According to my experience I never find any predictions to the point because if we go back few months in the previous year many people predicted that 2018 will be the year of bitcoin but the fact is against those predictions. This year is the worst year for bitcoin so far and there is no signs for growth in the future in the coming few months.
In my opinion the future of bitcoin is very bright, although the price in these days is low and many people discouraged from bitcoin, but it is obvious that in the future the price of bitcoin will grow more and investors will make huge profits. One thing more that bitcoin will take over the market in the future and will be the mainstream in the future, thats why people want to invest in bitcoin.