There is no need to redesign our society. Our politicians and us are continuing on the selected course and well-worn paths. Only scarcity, e.g. following a disaster, can force us to redesign our society. This could be caused by a shortage of resources, money or food, but also overpopulation, which could jeopardise the survival of our society. You would expect politicians to take this into account.
Maintaining our lifestyle with so much overconsumption by so many people with so many demands on a small piece of land, forces us to make decisions. Hard nuts must be cracked. Structures will have to be completely demolished, so that something new can be built on its ruins. Immigration restrictions alone have no effect anymore. Imposing penalties and special taxes to change people's perceptions are not enough.
It would be very challenging if the Dutch, who are notorious dyke builders, are forced to admit that the sea has taken back a substantial part of the country. This would cramp everyone even more on a limited area, which would take the condition required for a sustainable society even further away. Villages will suddenly become medium-sized cities and every train journey would only pass through sound walls, concrete walls and tunnels. To be able to enjoy a visit in nature we would first have to endure extensive traffic jams before we can see how things could have been here.