I don't think that the ICO-driven altcoin will return to zero, maybe only some of them don't have a future. But a coin that has potential will be far better and possess a future.
Indeed, it cannot be denied that not all ICO tokens will end at zero valued, but the fact that most of them after listing in the exchange price are always undervalued. And if this continues, I am sure the future of ICO will no longer exist.