Participation and long-term decision-making Democratic Constitutional Design

Is participatory deliberative democracy suited for long term decision-making? Maija Setälä and her colleagues are currently working with our regional government in south-east Finland where the goal is to involve citizens in long term planning for the region. The deliberations involve working with future scenarios and different types of participation including a citizen assembly. Can randomly selected citizens come up with good long-term policies or is that something only elected representatives can do?