Until recently, Europe lacked the tools for managing a sovereign crisis. Between 2010 and 2012 EU countries disbursed some € billion in loans to their partners in difficulty, either directly or through the newly established common financing instruments (the European Financial Stability Facility, EFSF, and the European Stability Mechanism, ESM).
In my view, it makes more sense to spend that money on enhancing the robustness of the existing systems, e.g. in relation to cyber risks. I acknowledge that the above arguments may be valid in other countries where e.g. the payment systems are more fragmented.