I understood (and my perspective changed quite a bit) as soon as I read about Miller's Law in the exchange you linked. I really like having a handle for the concept (for my own sake, its usefulness is curbed by not being well-known).

I believe the default interpretation of the question you asked is the interpretation that I had (that you were using the Socratic method). The reason for this being the default interpretation is that there is an obvious, intuitive answer. (This question was a good counter-argument, which is why I think it was up-voted.)

... to deflect this interpretation, your question could be worded to be less obvious, and allow more nuance. Perhaps, "If you could remain healthy indefinitely, do you expect you would ever choose to die?", or, "If you could remain healthy indefinitely, for which conditions would you ever choose to die?"