Many people are familiar with the last part of this quote from the Spanish philosopher George Santayana but fewer recall the first part:
Progress, far from consisting in change, depends on retentiveness. When change is absolute there remains no being to improve and no direction is set for possible improvement: and when experience is not retained, as among savages, infancy is perpetual. Those who cannot remember the past are condemned to repeat it.
Pretty old fashioned sentiment, no one respects that now.
In just my lifetime, something as basic as the nuclear family has been humiliated and practically abolished.
What will the next 70 years bring?
IMO there are no brakes on the engine of social revolution.