I think, It's not a bad sign of ETH. When bitcoin grow will stop some time, then ETH price will grow fast.
Yes bitcoin and ETH both grow with time and i am sure ETH will be also high now i can see time passing ETH is gaining value in very near future we will see huge price increase in it so every Altcoin use to struggle and wait for the perfect price to reach till the end 2019 I think ETH Will gain remarkable recovery so hopping for best.
Look at its satochi price. It is always losing since Mai 2018. People are now only interested about getting some bitcoin satochi. Most of new traders are not interested about ETH. Can this change? For the moment no. It would need a very big dump of bitcoin for people to change to altcoins. Altcoins are surely going to suffer too, but the dominance might become more normal. I don't think bitcoin can increase more than $11000 now. It is more or less when it had 70 percent of dominance. And people are exiting some profits from the cryptos market when they can. It can only go down little by little. It will take time maybe, but that will happen. Be patient, one day thoses pumpers are going to be exhausted as the market is decreasing little by little.