Yeah, I noticed that today too when I visited coinmarketcap, amazed that bitcoin's market dominance have dropped to 47 percent which shows why bitcoin's price has been showing some kind of backward movement while Ethereum and other altcoins like dogecoin are increasing immensely in value, as Ethereum's dominance seems to be increasing, it looks like dogecoin is also taking even much higher market dominance than Ethereum is doing, but this is just a guess in my part, I might be wrong about this as I haven't sat down to really study the market dominance chart, but all the same, am happy that altcoins are really moving up bit by bit, I just hope the upward movement extends to other altcoins I hold.
It all means so little in the big scheme of things,,, dominance even for ETH may climb down at some point when all the BSC/BNB and other Defi and smart contracts keep pumping out tokens with crazy max supply and just overtake each other.
Bitcoin has a max supply and so small compared to everyone else, which is why it is not impossible to see a big price value for it.