I think that if bitcoin falls to $ 1000, then Ethereum and the rest of the cryptocurrency market will fall after It, and many projects are likely to just die, but so far very few projects have died with a decrease to $ 3000.
The price of bitcoin has significantly influenced cryptocurrency, both in trade and Ico. So, as happened in 2018 when the BTC price dropped quite deep, many Ico projects had difficulty achieving sales targets so they had to be extended and even stopped. Only a few projects are successful, and even after going through a long and difficult process. So if there is a deeper decline from this, it can be predicted that Ico will be increasingly difficult to develop.
Some icos were used bitcoin as the crypto to determine its price gets a lot of impact just like those platforms are putting the price for their icos when bitcoin worth 8k and after btc gets down to the 3k and there was more than 70% decrease from the ico price.