Hey. My opinion is that not only ICO, but also trade will be no less popular. Recently, trends in the market are changing, I think that by the end of the month most currencies will change. All the time something is falling, but something is growing. And the answer to yours, I think ICO will live for a long time.
The crypto market is always changing, it will change not only this month, but also in the next. You can try to anticipate these changing and receive a income with the help of trading. But ICO's allow the scenario better (as least for me) - to invest in a perspective ICO project and to hold their tokens for a long time. It can bring you better income in the future