The market conditions are weak, but if the project is good it's better to start now because it will take 1-2 years to polish it (including ICO, developing, testing, and working beta launch). So if you want to take your market share then don't wait, start it as soon as possible.
I agree on this eventhough ICO was 100% successfull the coin could be dumped due to market conditions and invesent is for a long term