You are right that a cashless society is on the way ..but what one the visa banking one or the cryptocurrency one and at what point will the banks make there move to take it over in some way they will try..
And with the internet being the the main tool for managing digital currency, it leaves it easily shut down ..
Viruses power outages most governments have full control of the internet and can shut down there country if desired, a lot of weak point to consider..
Cryptocurrency needs the meshnet to live on ..
This might make it truly independent and far less able to be shut off with the flick of a pen.