I am right now a little bit researching about financial stability and monetary policy.
It seems that monetary policy through a central bank is pretty important for the global financial stability.
For example if there is a financial crisis, central banks try activly to stabilize the financial system.
If Bitcoin would replace fiat money and such a crisis would occur, wouldnt this lead to long term financial instability?
Monetary policies can fail or be tainted by conflicts of interests. Decentralized protocols are predictable and uncorruptable. Apart from that, no worries. Bitcoin will never replace fiat money and doesn't need to. Some form of inflationary fiat will always be required to enable economic growth. Look at Bitcoin as a store of value and as a hedge against failing monetary policies that just so happens to be usable as a currency as well.
We have the same view on fiat money and cryptocurrency. Fiat money will always exist because not all people can adopt modern technology. Bitcoin and fiat money can be existing alongside each other peacefully and there is no need to replace one another. Realistically, we are still converting our Bitcoin to the local money and it can take a lot of years before there will be a mainstream mass for any cryptocurrency.
Seriously speaking, I don't really understand why we have to push for the fiat money to go. We should let all forms of money exist as long as they are legal tender of a given place and there are people who are using it. It is quite a very big ambition to try to convert all people to get away from fiat money and just use cryptocurrency. We have to remember that the stores we can see down in the isles are not yet accepting Bitcoin and as of now even if they do I will never use my Bitcoin in buying anything because I am speculating that it will further grow in value.