> I am more confident that nations which turn their back on it, or shut it out completely, will see a loss of otherwise valuable businesses and mindshare.

This is a very under-appreciated point. US persons (citizens and companies) assume the US banking system for granted. Many countries (even some developed ones) do not have a developed banking sector and by consequence it is harder/expensive to make transactions, access to capital is limited and access to markets can be restricted which limits opportunity.

Crypto-currencies requires significant expertise, much more than the current banking system. Countries who will attract these companies and knowledge will have lots of sway in the international economy in the future.