Now our vocabulary grew past the basic white-red-yellow-green-blue-black separation and I believe it will keep growing. I say this because I consider cyan and magenta to be new ramifications of that spectrum, both colors are well recognized by name today.

I think this is due to how information is accessible today. Languages seem to be able to separate a hue in two or more once the actual names are already established—when the burden of naming and categorizing hues gives place to the lesser burden of only memorizing the already named hues, then we can afford to create another new name. Although brands of nail polish and ink have dozens of different names for their colors, they often don't reach a consensus, and the same color can have different names between brands. Without a consensus (language is primarily based on consensus) all these subtly different hues can be said to remain unnamed, I guess...

I also wonder if there's a limit to this, to how many colors we can name before considering naming all colors in hexadecimal on a daily basis.