You seem very well educated on the subject, what do you think of this idea...
I think any country (like Argentina or Iceland or Greece), that declares bankruptcy becomes eligible to be "bought" to become part of another countries affiliations.
Seeing as the former government there made such a mess of things, that their people are now considered broke, that country should not be allowed to continue ruling itself, without the guide of an existing country that is successful. Countries take away peoples freedoms without choice. When yo are born into a country, you can not say you do not belong there, or will not follow their rules, and there is no "international neutral zone" which allows people to live without rules, except the ones they "want" to adopt for themselves.
Now it sounds extreme when you consider we have great laws against killing others, but say in a country like colombia or cuba, where the dictators stop you from leaving at all costs, forcing you to live in conditions that you find unacceptable, then this is not free will, as you were born into this, with no choice to another option.
Now keeping this part in mind, when a country whose has responsibility to be the best they can, becomes a danger to all its people because of the corruption or incompetence or whatever the case might be for that country's mismanegement, that country now becomes eligible for a buy out. All resources become another countries with the exception that you also have to accept citizenship for all its people. The uS accepts Argentina to be a 55th or 56th state, all the Argentinians become US citizens, as their resources could not be had without this, a fail safe if you will.
This I would hope to become a movement that spreads across the globe. Imagine if we had no borders because the world was 1 country!
How much would we save on border patrol globally
How much would we save on legal tender management.
How much would we save on transport fees if we have no customs to worry about.
How much would we etc, etc, etc ( fill in limitless vision here )
What I see happening with the reverse if we have splinters of countries everywhere, is that to get your goods by land from spain to ukraine, you might have 150 countries to get through, you would have 150 more chances of catching smugglers, but also 150 more chances of corruption and something happening to your goods in transfer.