The actual study will likely run for 5 years. The shorter pilot will help us refine our research design and mechanics; we don't expect to answer any of our research questions with the pilot.
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.
Most people will never abandon their job for 5 years of guaranteed income, even if they hate their job.
What happens after the money ends? They have to re-train, search for a job, apply, interview, explain a 5 years gap, climb the office/workshop ladder from the bottom again...
Situation changes radically if the income is guaranteed for life, if they are guaranteed to never have the necessity to work again.
Since a study limited to 5 years can't, by design, satisfy this last condition, it won't be significant at predicting how many people will leave a "hard" job.
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