BTC is very small in the real world! People in many countries in the world do not know BTC, there is no way to use BTC!
And BTC's impact on the real economy is limited!
Its not true. Bitcoin is not small infact many countries worldwide are now using it already. Bitcoin today is now verry famous and verry well known due its amazing features. However bitcoin do have weaknesses or disadvantages, few of them is bitcoin wont possibly work without the help of internet connection because bitcoin is a digital currency which means it needs an internet and electricity as well in order to operate the device.