ICO's are both potential and challenging as per my knowledge. The ICO should be successful during the initial period and need to grow its coin post ICO period as well to attract more investors and stabilize in crypto market. If the ICO is a potential one it can sustain but if doesn't then it cannot survive in a good price. I think most ICO launched this year is struggling to meet the ICO price after they came into an exchange and they are less than 50% from ICO price currently.