As well, most countries and places ain't adopting it yet due to being used in black-marketing, frauds, scams, smuggling, selling drugs, etc...
That's not the real reason. Governments usually provide you with fake information and create illusions.
Why don't we get rid of the $, it's being used in all that you've mentioned? Or is the government trying to say that Bitcoin isn't being used for anything else? In either way they're wrong.
BTC can be helpful in many developing counties, where people do not have access to banking system. it could be a possible solution during hyperinflation.
In many developing countries? What's your estimate for the number of internet users in such countries..?
Effectively everyone has a mobile phone over there. You just need a way to transfer the coins, and you're good to go. You only need a way to transfer information to do that. Even text messages suffice.