Nope, this is no existential question (although...). Everybody's talking about "When will Bitcoin die", but what if you die, and your family don't find your key, or don't understand it, or think it's only a useless sheet of paper with some code on it, or simply throw it away... Does this mean the currency's gone forever?
I find the possibility of this event rather realistic (yup I don't believe in eternal life), so that means that someday there might be 21M BTC but only 18M (and counting down...) is left in the market?
If we're not keen in making writings and passing it down to whomever eligible, then you should be worried and start writing. Write whatever possible data or information regarding how to withdraw your bitcoins out of your wallet and be used again properly.
Yes, and I think that is being ready and that looks like we're making our will to those persons we love that we're going to leave after death.