Out of this certain amount of bitcoins about 10% or maybe more bitcoins aren't moving at all and that too from the initial days of bitcoin, so it means that these bitcoins won't move at all and thus making the supply even shorter. Bitcoin won't become a bad investment at all not even in the future as well, with more people joining the market the price fluctuations are also increasing as compared to 2014 or early days of bitcoin. Investors are also getting increased day by day with new companies joining the blockchain market and making new products which is increasing the demand of bitcoin even more.