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
I think right after one of this "major" countries will accept bitcoin on government's level other countries will follow one by one to not stay on the side of progress. I have heard that Russia plan to adopt bit coin in 2018 year. As always they want to be first, but we will see what kind of results it will bring to them.
No country is trying to be first to introduce bitcoin to the people, they are all passing different laws because not one of them really know what they are doing yet but they just don't want to miss out on being able to introduce a new tax on the working people.
My country rushed into it so blindly they ended up double taxing it, luckily that didn't last too long.