I'm wondering this because is such a real threat to bank system and we all know how banks and governments are tightly linked !
BTC could make people more autonomous, self-resilient, being their own bank. You can use it like cash, making your transaction almost untraceable (or untraceable using e.g. monero or dash or laundry systems) : this is governments worst nightmare, isn't it ?
I totally agree with you. If BTC doesn't get any the regulation, it actually would harm to the banking system, especially for the government. As you can see, BTC is convenient and secure in the transaction. Especially, I can't get track of the authority. It would lead to the result that they couldn't control the circulating of the national currency and get lost their tax of the transaction in the country.