I guess the most possible large country that will recognize bitcoin is Switzerland, their traditional secret banking service has been heavily affected by the US after 911, bitcoin could give them another opportunity
Ths Swiss love their Swiss Franc and they will keep it forever. They're very tolerant towards the use of other currencies though, and most shops in Geneva accept Euros. Some of them are also
BTC-friendly. I remember there was a
BTC ATM in Geneva a while ago, it's gone now, but the Swiww have always been at the forefront of financial innovation.
And I have explained in this post
https://bitcointalksearch.org/topic/m.13211430 it does not really matter if there is a country behind bitcoin, because anyway people will not use their precious bitcoin to exchange useless goods and services, they already have fiat money for that purpose. Bitcoin's main advantage is to store value and do international remittance, both resides in finance area. It has almost nothing to do with legacy economy, and is not affected by any legacy economy either
I'm not talking about value, I'm talking about image. I think
BTC should stay totally international, without any link to any territory anywhere, but cyberspace.