All other altcoins would fall in the market since Eth and BTC prices have already dropped in the market. This happen because many coins are built on their blockchain.
Yes, you are certainly right on that but i think the main reason also is the demand of each coin. Thats why if keep on selling our coin it just helping the market turn red. However, the time is still young we can fix this by just holding our coins to increase the number of demand and soon its price will follow.