The Human Development Index is likely to be driven, in the future, by the World system which is in Growth-and-Collapse model.
Stagnation-and-collapse will not be believable forecasts for optimistic commentators, but it is hard to see how Human Development will stabilize if the World System is in collapse mode.
First, let me discuss how my version of the HDI (WL20_HDI) was constructed. I felt it was necessary to recreate the index and address criticism of the UN's methodology.
Notes
Country Distribution of the HDI Index
WL20 HDI Measurement Model
WL20 HDI Codes
The definition of codes in my WL20 HDI index is presented above.