I'm not sure I would class some of those countries as 'major' ... but there is a general sense now that bitcoins are leaving the USA, and at an accelerating rate.
I also think same as you not sure if many country participate in situation but i predict someday bitcoin make global function in all country because its used in transaction and in paying also
The system was already built so I believe if people will be fully educated and understand that bitcoin is legitimate, they will have the
confidence to use it. At first look they might think it is a very complicated system but once they will try it, I am sure they will be impress with bitcoin.