Bitcoin provides the advantages of decentralization and is not linked to any economy, country or entity, but at the same time the unified global currency needs to be stable so that it can be used in international financial transactions.
The big problem is congestion. We have recently seen how crowded the network has become, delays in sending transactions, and high fees. In the case of global adoption, this will be the biggest problem.
Those who know the secret and how to earn from the Bitcoin market had been earning some crazy amount from the market due to there risky free attempt not minding what the public think about this great cryptocurrency. It is always wise for us to make decisions that will give us some tangible profits in the future even though the gain will not come now that we needed it or are attempted to earn quickly as possible as we want.
It is good when we invest in an asset that will give us good evening in the future making us superior than the people that are after earning immediately in the market. Bitcoin is a good asset and I see it as a great investment if we are able to stay calm and ready to be patient enough to earn well from the market. It will be very difficult for Bitcoin to be used a currency because of the volatility.