The gold standard was turned off far earlier than 1971. In fact, all commodity money standards have suffered subversion or suspension by financial institutions (suspending convertibility of notes) and governments at various times. Nor was gold arrived at by the will of market forces. It was imposed through bank charter, displacing the then-dominant silver in the process. Nor was the international gold standard well designed, for R.G. Hawtrey and Gustav Cassel presciently anticipated its collapse and resulting great depression thereof.
Monetary reform is definitely in order, but commodity money has nothing to do with it. Convertibility requirements can be satisfied with interbank clearinghouses and other means.