These include: The security level of the individual institution, i.e. its capacity and expertise in managing risk and its cushion of capital against losses. And closely linked to that: the overall stability of the banking system. I assume nobody wants a level of financial market stability that is lower than now. as well as The regulatory burden and level playing field aspects.
In the meantime, all the countries concerned have a primary fiscal surplus, which means that they are reducing their debt bit by bit. And all these countries now have a current account surplus; they are exporting more than they import. That is quite a turnaround. These achievements are now hanging in the balance because one country may no longer want to do its part.