Bitcoin dominance in the crypto market almost 51% right now. If bitcoin price will go to the moon again then this dominance percentage may increase! But we have many options in altcoins, and many altcoins are better than bitcoin in several ways! Do you think, in future, Altcoins will dominate the crypto market? Or will it be a strong competitor to bitcoin?
I don't think altcoins will dominate in the future and grab the leading positions unless bitcoin will get out of the market. Bitcoin is like a father of the crypto and will always be the strongest one. At the moment I don't see at the crypto market a strong competitor to bitcoin. Maybe in the future some day.