The extension of the ICO, says the lack of interest of investors. If there is no interest, then there are no fees. If the ICO collects little money, then who will be interested in this project in the future?? After all, tomorrow there will be better and more powerful projects with their ICO and people will invest in them.
Community's participation defines how ico's will proceed, the more investors that will support the project the shorter the ico period will take, developers needs to have enough funding to develop their project they needed to meet the target amount to collect before they can proceed and make the project /system to be more successful, that's why extension is frequently been done by most developers to meet the target capital.