Do not compare things that are physical and digital because people will always say "but can I hold it" as an argument.
Ironically, that same argument can be made of the humble Tulip which once cut has a finite life span and even when potted for a longer shelf life invariably has a finite life span too.
If someone bemoans they cannot hold bitcoin in their hand, remind them their fiat bank account is no different - just some ones and zeros on a computer's hard drive (except with no block-chain for verification)