Traditional finance did not incorporate the Scary Men with Guns. They were already there, are still here, and will remain regardless of how many layers of decentralization you add.
Traditional finance's crowning achievement has been to successfully integrate itself into civil law: we don't send people to the Poor House anymore, and we don't execute bankers (or ordinary citizens) when they fail to finance the King's wars. Among the "kinds of crime" you can conceivably execute on as an individual, traditional financial crimes are among a handful that are regulated by agencies that don't have actual criminal enforcement abilities.
There is no "going back to the drawing board," only muddying the waters and hoping that someone won't notice the Scary Men with Guns (who have no intention of leaving) in the reflection.