I have been looking into this and have come to the conclusion that those who in their childhoods had dual citizenship or triple! are the ones who will have these options at the least expensive price. For example, I spoke with a guy who is an American and Canadian citizen due to his parentage and married a German citizen. His children have US, Canadian and German citizenship or access to services each of those citizenships offer. For me to get that type of 'coverage' if you will, I would have to pay taxes across three different countries - as many on Boglehead and here have attested, the Tax treaties are tortuous especially between the US and other countries due to the US insistence on taxation of income regardless of citizen location (they probably also said on another planet!) and our tax free or deferred investment vehicle options are not considered so in their countries. One must have a lot of money to burn without jeopardizing one's lifestyle to have that type of an existence.
So, I will not be the perpetual nomad I thought and will be re-homing to the US in my retirement travels to reset clocks with regard to visa/visit time-frames. I just consider myself fortunate to have had the opportunities I have had the last few decades to live overseas on the economy for extended periods of time and travel locally.