I think bitcoin may not become a reserve currency of the world at this current time but perhaps in the near future where bitcoin is already under mass adaptation globally, then it may have a chance that it will be considered soon. Bitcoin is a growing currency and the leader of all cryptocurrencies will become the most valuable currency in the world where many people would wanted to have their own.
On my opinion, I think bitcoin will be the primary currency of this world for every country except of those country that banned the cryptocurrency. In a world were politics is controlling the financial system and reserve currency is doomed from its real purpose, but for power. But I also think that bitcoin will not be the reserve currency for the future as it is very much fluctuating but, Maybe Etherium will get a good stable position in the cryptocurrency world.