The issue is finding somebody to buy the coins you receive otherwise you end up with overseas transfers and the benefits are lost.
Or better yet, a merchant(s) that accepts bitcoin. Then, bang! The network effect. As long as these countries don't become hostile to the concept.
I can't see why they'd become hostile. In fact I think the opposite is true and I think they'd really embrace Bitcoin. Bitcoin could really thrive in countries where it's hard to get a bank account or the wire services charge extortionate fees, and I'm sure merchants would gradually pop up if the demand for Bitcoin was there. It's only natural really.