The Australian doctor who proposed it may be right. Who knows? I posted the story here long before Trump foolishly mentioned it from his seat of power and unsettled the market, so that people with lupus are struggling to get hold of the drug with which they are treated.
As regards the economy, it will struggle for a while, but interest rates are extraordinarily low, so paying off the interest on any new debt will be a doddle. If they are sensible, they will roll all government debt into long term bonds asap.