Many ICOs have their token sold at a fixed price vs. the ETH. For example: 1 ETH = 1000 Tokens.
So does it really matter if the prices of ETH/BTC is dropping?
If anything, then buying now you get more Tokens for the $, right?
If they have locked the price against ether/btc , like a fixed number of tokens agains 1Eth/Btc then there is no effect if their prices go up or down.