A lot of the 90s era monetary economics that the euro is intertwined in has been collapsing as a dominant school of thought. Covid plays a role here, but a lot of it has been building since 2009 & the greek debt crisis. I don't think many are ready (especially in germany) to throw out institutions, even ethereal intellectual ones... but OTOH change has come. Military emergencies, historically, are pivot points for monetary infrastructure... FWIW.
Interestingly, I'm not sure the german constitution necessarily has to change. In some sense, the more conceptually radical solutions wouldn't require it. ECB debt, or at least the debt transferred to the ECB in the 90s, just needs to stop being considered debt.
