“It's hard to make accurate predictions, especially about the future.”
Information Systems Prolog
The simple process of predicting the future is difficult enough. Predicting the impact of a significant planned change is even more difficult. There is a kind of Uncertainty Principle at work. We plan a change with a view to establishing, post change, certain desirable or required characteristics. Problem is, the process of installing the change can and often does alter what we would see as desirable or required.