Why would any country's government choose to forfeit its own power by adopting Bitcoin?
And as for the citizens of developing countries, Bitcoin is way too impractical for the types of transactions being conducted. It may happen one day, but I don't expect villagers in Cambodia to be paying for bananas with smart-phones any time soon.
Any shit government in the world could drastically strengthen its hold on power and ability to do things if it adopted Bitcoin. The peasants wouldn't have to use Bitcoin in their daily lives, but it could be used for larger transactions of government and business. It would be a great improvement on using their shit fiat currency.