Until a week or two ago Bitcoin had never been below 75% of the total cryptocurrency market cap. It has plunged from 85% to below 67% in a few weeks and has currently recovered all the way back up to 69% at the moment. That's a bit premature to declare victory in this crisis.

The recovery may just be a natural pullback, insofar as it does not seem to be based on any major news. I've been tracking the tilt of news stories for BTC/ETH/Dash/ZEC - the same ones you mention - pretty closely the last week or so as part of a practice exercise. There has been close to nothing for ZEC, mostly incidental mentions of Dash apart from some accounting s/w news, but ETH has been getting almost completely positive press and more of it than BTC, where the news has been dominated by the Core/BU conflict and is negative in tone.