Bitcoin was launched in 2007. It's 10 years and still no country has approved Bitcoin ?? 
and in 2018, 2nd richest man "Warren Buffet" said "bitcoin will end up badly"
and in 2018, 2nd richest man "Warren Buffet" said "bitcoin will end up badly"
If by approval you mean implementation then yes, no one is accepting it as a currency and it won't be accepted in the future.
Bitcoin is adopted as such within many countries that want to evolve and gain influence amongst the crypto market users.
Bitcoin won't be accepted by countries because each country has their own currency to take care off. Bitcoin is just an obstacle to which they must adapt if they won't want to lose the needed money from their citizens that are investing in the cryptos.