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?
Not all ICO project is in fix price because some of are not want to do a fix price because they know market is volatile and ICO have different strategy that's why do a fix price to their ico project.