In the specific case of the HICP, the precise estimation of such a measurement bias continues to be surrounded by uncertainty. But taking into account the continuous improvements implemented by Eurostat in the index, the bias is likely to be small and to decline further in the future.
The financial system is a private risk sharing device, but we have learned the lessons from the financial crisis in terms of budgetary costs, when excessive risk-taking by the private sector was eventually borne by the public sector. We do not want to revert to the old world of implicit government guarantees for risky behaviour of financial institutions.