since you love memes so much i made you one from scratch to describe what you call "dominance" really looks like:
https://i.imgur.com/kfAZJ66.jpgback in 2010 we had bitcoin and we had other altcoins which were trying to DO something and we had occasional shitcoin here and there. what you call "dominance" was the market cap which was 95%.
in 2018 we have bitcoin which has grown a lot but we also have a lot of shitcoins, most of which are a big pile of shit only because they have a huge supply which makes their market cap big. this also decreases the market cap share of bitcoin making the percentage (which you refer to as dominance) smaller. they also are hiding (burying) any good altcoin that may exist under their pump and dump crap!
At first I wanted to rebel, but then I realized that you were right. Bravo.