The demand for Bitcoin is very high. Before, when btc is not popular it was even used to buy a pizza. And now the cost of that pizza contains millions of money. Because btc's value is developed through time neither because of its popularity, the people who trust in bitcoin (especially the investors and traders) and the money that people sacrificed for it, the fact is that "it will really become more and more expensive as the time goes by." For those who invested early, they would not think of BTC as expensive. For those who will start now, you would probably think that BTC is a crypto in which it is really hard to invest into. You can try other alts and eventually jump start your way to Bitcoin.