Software projects, whether games or business software, need a central vision and a leader. For solo projects, that's easy, because there's only one developer, but for bigger projects, if there's nobody in charge and no clear direction, there's going to be a mess at the end. Open source projects are particularly hard to direct if there is no leader with the final say. Once they lose that leader, that vision, they fall apart.
Mokalus of Borg
PS - Even professional projects fall apart without leadership and a goal, though.
PPS - And some of them start out on a road to nowhere.