Now investors stop to trust IEO. Because many projects do not realize all planned ideas and price ot the tokens falls.
During 2018 when market falled investors lost a lot of money. That is why they lost their trust to cryptocurrency and do not believe in prospects of cryptocurrency projects.
After the fall of the market there is a raise of the market. New people will come of the market and old participants will start to invest again hoping to compensate the loses of 2017.