(...)
The fact they are gone forever, to me suggests that this cannot be 'the future of money', as more and more will continue to be lost each year.
I don't find any negative here in Bitcoin itself, negative only on the owner of Bitcoin since it can't be used by someone else if he/she didn't want to give the keys to other people like his/her family.
This could be a lesson for every Bitcoin hodler that their keys should pass to someone else if ever there will bad things happen to them.
The positive effect for Bitcoin itself here is the supply will be reduced if ever those Bitcoin can't be access forever.