1. Turnover: denoting a high rate of (possibly good quality) goods/people within a cyclical process within a period of time.
2. Churn-out: denoting the provision of 'functional' outputs of dubious quality in a methodical, banal manner (see Price Waterhouse Cooper, most think tanks)
Churnover therefore denotes a high rate of banal outputs of bad - or no - quality at all.
Churnover can therefore be applied retrospectively to most the things that have occurred over the lat 30 years.