Banking Union - not so necessary

Today one of my favourite economic commentators states that "banking union [is] an absolute prerequisite of a properly functioning monetary union. (Jeremy Warner, Daily Telegraph). I beg to disagree. The only reason why weak banks can undermine the solvency of the host states is the lack of a proper regulatory environment in each of the euro-zone member states. As I have pointed out again and again, we are far away from reform measures that would put the banking system on a stable footing. If these measures would be implemented there would never be a requirement to cross guarantee banking systems, nor would there be any requirement  to have a European Banking Authority.