You are correct that the sentiment of "things will get better, as long as we follow the way" is an empty appeal to the future. But "things use to be better, we've lost our way", that the systems around is are unnatural and therefore wrong, is a powerful drive for a complacent society. A catalyst for social change.
As the oft-repeated 1984 quote goes, "Control the present, control the past. Control the past, control the future."