But still, the biggest issue for me is the cryptocurrency will not going to be a currency like for example bitcoin since it has a decentralized system and cannot be regulated by the government.
Yes, it is becoming regulated - AMLP/KYC/FATF Guidelines are trying to make a cryptocurrency environment as similar to banking system/wire transfers as possible (what is forming some obstacles which are practically impossible to be fixed). The worst possible scenario is that there will be a list of cryptocurrencies regarded as a pure investment (eg. Bitcoin), which can be traded only if you have a crypto-broker license.