I wonder if there will ever be a time when there is a marketplace of citizenship. There are plenty of non-americans who want to become US citizens or immigrate legally. And at the same time there are US citizens going the other way.

An example could be an Italian wanting to move to the US because he works in Tech and a US citizen wanting to move to Italy because he works in Fashion. A marketplace would allow the two to work out a citizenship swap, with the necessary immigration paperwork.

In my view it is a win-win because

a. The immigration is two way.

b. In a global economy we can expect more and more people to move across countries. This service would facilitate that

c. The immigrants would want to do such a thing out of real interest in improving their lives and thereby the lives of their chosen country.

Given that Passports are a fairly new invention that's about a 100 years old, (thanks to the French and Germans just before WWI), I don't see why it can't be created.