Bitcoin's value is constantly increasing. Why is the price of bitcoin increasing over time?
Bitcoin has the value people decide to give to it, at first it had no value except as an experiment and proof of concept, but then people began to realize this technology was innovative and it got some value and as time has passed more people have agreed with that statement and that is why bitcoin keeps growing in price, because people believe on it.
I also think that the value will depend on people, but unfortunately some people spend a long time being indifferent to this sort of thing, and then certain circumstances cause them to take an initiative to go towards Bitcoin. As for example, usually many people only look for Bitcoin when their countries are in crisis, or when the local currency is in trouble. Obviously, the people who take the initiative to invest in Bitcoin before such events happen are those people who manage to get a greater reward.