More than anything. Crypto currency's weakness as a means of exchanging goods and services is its volatility. A volatile currency won't be adopted by merchants in their businesses. But tthe same volatility is the advantage of crypto currency as an investment. I just hope it becomes stable soon so we can see adoption.
Volatility is not a weakness because in this way the price can grow even more depending on the supply and demand so we can expect higher prices in the future since the statistics in the market is increasing in a fibbonacci sequence.
It can be consider as online banks or the place where we can store our money. Maybe in future when the price stop increasing and become stable not only people but government also accept it as currency and use it in our daily basis.
Bitcoin is a digital currency and is always acting as currency which can be used for different purposes both as an investment source and payment mode.
If you have Bitcoin right now then look at its market value and then tell others that you have precious coins though stored in digital form but works well than anything. Now, German banks are using it as loan payment so the cloud is growing and expanding with the passage of time.