As of now I can not think of any other crypto to replace bitcoin,for me bitcoin will still the number 1 most promising and profitable in crypto currency.As many said it is the king of all and it hard to beat and replace by others.It is also true that there are are good coins there but as of now still bit coin.
future bitcoin will be beat. At present, bitcoin has been developed for a long time by old technology. So, I see bitocin exchanges taking more time. In the future there will be coins that can replace bitcoin.