If I die (let's be honest, that will probably happen), would my wife or family get my coins? What if they don't know my passwords/private key?
Then it's lost, forever. At least if you don't give them access, but if you do, then well it's just like transferring ownership of the assets from you to your family, but if not well, to quote what I just saw earlier.
I believe this guy knows what he's talking about:
Lost coins only make everyone else's coins worth slightly more. Think of it as a donation to everyone.
So fear not! If you died and you weren't able to give access to your wallet to your family, at the very least, you made a donation to every other Bitcoin holder out there!
If you intend to lose it from the beginning then just burn it. It's true though, less supply makes the price good.
I agree that cryptocurrencies are the only things you can bring with you when you die, no one will ever loot your grave for gold today. Leaving your coins to love ones is good. Let them just have something to do than just grieve. Why bring something to the grave when there is no one will spend it there?