[bd]

Thanks for the clarification.

Five years is much better but fundamental issue is still there - "there is a deadline after which the utopia ends".

Did you consider maybe using fewer participants but possibly much longer time-frames (e.g. for the same budget 10x less people but 50 years of BI, or even 20x less participants and 100 years of BI to have safe margin)?

I'm aware this would be hard / impossible to personally see to the full fruition (see e.g. Up series [1]), but even just that 5 years window frame for the observation and research (which you already prepared yourself for) but with participants who could have "piece of mind for the rest of their lives" could radically alter the results of the experiment.

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[1] https://en.wikipedia.org/wiki/Up_Series