Judging by the market situation, it might be better for ICOs to accept fiat investment or at least for them to change it in fiat immediately after the payment.
I concur. Fiat is the only stable coin at the moment. Back in the summer of 2017 ICOs could gamble on a growing market and keep their crypto currencies but these days it is too much of a risk.
The intersting thing is, that now with crypto at the bottom, it should be more rational to take crypto currency because it will go more upwards than fiat in the next years.
But for the short time and to make sure the project remains capable of action FIAT is probably the more stable choice.