As Bitcoin was the 1st P2P payment system. we are those who make it, and we are those who accepts and contribute our time to make money and make payment system reliable and it is the king of cryptoworld. Bitcoin will be always King of cryptocurrency and there's not even a single currency which replace BITCOIN. but we did't know about the future like maybe there will be more currencies which have better partnerships but no one can replace BITCOIN.
why we sell Bitcoin or alt currency in loss. whales manipulate us they make profit and we give them huge profit and sell our coins in loss. Be careful in future learn how to hold a thing and never get any loss. proven and tested.