Cash in life won't be killed by cryptocurrency, only extended by it. From regulation wanting this world without paper, devastating events would happen and influence cycles reversed. Bitcoin and other properties certainly have changed the intent or views made by public officials, however plans to fix instead of hurt are also in positive effect for the first time since long history.

Don't ever believe that physical currency will be removed, it's likely going to establish grounds again adding to exclusiveness in taste. These scares are always in the media, so plan for every variable if wanting to feel safe.