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?
Definitely it will make you more profit when you invest in an ICO project that has lower market price value where the tokens is being paired with eth that market price is cheap. I will agree with you that this is the best time to invest with an ICO projects.