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?
There are some threats now, but they are not a serious threat and these altcoins will always become a serious threat, these threats will always be here but I don't think they can surpass Bitcoin supremacy, although there is a lot of Bitcoin clone and fork that threatens Bitcoin leadership.