I don't think that will happen forever but I do believe that most of the Altcoins were created to solve one of two flaws with Bitcoin. So although, Bitcoin is the major coin right now few altcoins may rise to match its price and demand. However, this may not happen forever.
we can't have any assurance if the bitcoin are the best cryptocurrency forever.but one thing I'm sure that I know now is the bitcoin is the number one out of all cryptocurrency. it is very popular to all and have a advantage if you have it also it have many benefits.maybe there's a chance that the bitcoin will loss but the memories made by the bitcoin wi forever in my mind and heart.