I've been noticing how the markets sell off based on ETH now, not on BTC. Whatever ETH does, the others follow.
If ETH is going up, the other will tend to go up.
If ETH starts to go down, the others see a hard push downward and quick sell off. This is while ETH is falling at a much slower rate.
BTC isn't king anymore, at least it seems that way. Everything else has a sharp drop off at the same time, except for ETH which was only dropping slowly and seemed to trigger to sharp drops in the others.
The push from the corporate and financial sector to hire eth devs and build apps on ethereum is pushing ETH to dominance. At least that's what it looks like to me.