You seem to be talking about BTC dominance. Naturally, if BTC's dominance fell, then many actors moved to altcoins. This is the season the altcoin holders are waiting for. Regarding Ether, it is one of the top choices of traders. Why? I think Ether is the second alternative after BTC. Their community is huge. The developer is also always innovating. Their trust in Ether is very big, even though the price in USD may currently reach ATH, but in BTC the price of Ether is still very far from ATH.
The market didn't deny the fact that ethereum made a huge imoact in the market demand today and yeah it can be hardly seen on the continue rising of exchange rate. Of ethereum. But for me even if that bitcoin dominance in the market was been decreased gradually as of the moment it doesn't change the fact that bitcoin is still bitcoin, the highest valued token in the market today. On the other hand, i am hapoy with the altcoin market today becauze so far it is good and everyone are totally waiting for this.