Those things which are available don't have much demand and bitcoin has its demand because it is also limited and the demand will increase when we find the shortage of it.
Because bitcoin is planned to be limited in number, so while the maximum amount has not been reached the price is still not normal, the ups and downs are very large. If the whole world holds bitcoin, you can imagine how valuable bitcoin is because supply and demand are not balanced. Then what will happen? There are two possibilities, the price will be very expensive or the price will fall. While other crypto currencies will advance even if not as expensive as bitcoin.