Such unpredictability is the logical consequence of the original route that the EU countries are following, which neither takes inspiration from existing institutional and other political realities, like the United States, and nor does it seek to apply pre-defined constitutional models.
It may also increase the risk of a deterioration of central banks’ inflation control, and harm the functioning of financial markets. Unfortunately, it seems unlikely that the current very high levels of public debts will melt away through low interest rates, rapid growth or inflation.