What are the threats for financial system from bitcoin?
There are lots but to me the main treat is the loss of control over what the general public do with their money. Especially from fees for world wide remittance which is a massive industry.
Treats means some kind of rewarding food. Just saying.
Anyway, financial systems in governments don't really have that much influence over the financial system of the country it is in. What they do to promote some aspect of the system is that they offer some kind of incentives for some action. For example, if they want to lower money in circulations, they raise interest on treasury bonds. This cannot be done in bitcoin, but the problem is that bitcoins are just driven by supply and demand. It is not backed up by anything. That is why the prices of these are just fluctuating so much.