Thursday was a bad day for those who thought the EU was a good idea, even if it was badly implemented. George Soros thinks that its disintegration is now all but irreversible, and he is hardly alone in that opinion. What would need to be done to fix it? I have no idea, but as usual I won't let that stop me:
A simple federal constitution in which citizens rights are outlined and federal governmental powers specified and delimited, with no special privileges. It should be short enough for any citizen to read it twenty minutes.
A democratically elected government with real powers - possibly a two chambered parliament modeled after the US.
Unified defense, trade, and finance.
Does that sound a lot like a United States of Europe? Well, duh, but one could initially make the central state weak enough permit a lot of local autonomy. You want to be able to avoid situations like the Portugal, Ireland, Greece etc. crisis where in effect Germany made decisions for everybody and the highest priority was protection of the bad loans of German bankers.