if the price falls after the ICO - it`s not mean that project not popular. It`s may be because now bitcoin price fall down, and many people afraid buy crypto - and tokens of this project too.
Especially this we see now, when bitcoin, ethereum and other coins have fallen very much in price. The new tokens released on the exchange immediately fall in price due to the general fall of the crypto-currency market. Now it's even difficult for teams to conduct ICO, many good ICO projects because of the fall of the market do not raise enough funds. Apparently also because of this very little registered new ICO, everyone expects the market to rise.