I think you are confusing usury with debt. 
debt is a tool that alows progress. 
Usury linked to FIAT is slavery since the one who controls the print, controls the money. 
But its a common misconception.

javier

that doesnt mean bitcoin  is the only money..

Economy is not a closed system, FIAT may die and will appear again and again.

If bitcoin is the only money, debt will still exist.

bitcoin

First time in human history that money is mostly in the hands of the pleb.

that doesnt mean bitcoin  is the only money.. 
It isnt.. 
Forms of money will always come around.. 
Economy is not a closed system, FIAT may die and will appear again and again. 
Debt is a tool
If bitcoin is the only money, debt will still exist. 

