If I'm not mistakin, DUSK is only conducting a private sale but yes, with the current market slump, I think it will have an effect as every investors are now becoming more cautious and in a "wait and see" attitude towards investing in crypto.
Still, Private investors are very different than a normal ICO investor. They understand the market manipulation very well due to which it DUSK's sale should not get much affected by this downtrend.