If disturbing it depends on the attitude of the user like what in the future so that the government is in need to anticipate the bad thing when bitcoin start inaugurate it and still make use of local currency as a legal means of payment until whenever.
The fact that bitcoin is spread in many developing countries. This will be a huge help for developing countries, they can increase their economic growth. Bitcoin can provide a solution to that, maybe they can try to use the currency and make the most of it.