In the decentralized Alt-Coin class, it seems that ethereum will probably remain the champion and the most popular. However, because ICOs built mostly use ethereum which's also a basic asset of their project, we feel worried that in time later, they will tragically drop ethereum and that will happen.
For example:
Previously, the price of ethereum had soared (very high), because ICO fever had occurred everywhere. However, when many investors are involved in the ICO, meant they are contributing to the success of the project in meeting the planned targets. If what they are targeting has been fulfilled chances are they will sell all of their basic assets (namely ethereum) with a large enough volume thus making ethereum prices fall sharply.