There are thousands of cryptocurrencies available in the market but still bitcoin dominance is 40 to 50 percent. We have to understand the fact that bitcoin is the only fully decentralized cryto currency available in the market. Ethereum shifting from PoW to PoS is clear indication that its controlled by a group of developers who have the ability to manipulate it and same is true for other alts also. No matter how many alts we have, there is no threat to bitcoin dominance.