Threat to what? Monero isn't a threat to the monetary system like bitcoin because it doesn't beat inflation enough to demand more adoption. Monero doesn't have a supply cap. So if monero isn't growing in purchasing power at a faster rate than bitcoin, it won't be adopted by majority of people. And if it isn't adopted in large numbers, then you'll be stuck in the fiat system. Why? Because you can't pay your mortgage in monero. You can't pay it in bitcoin either but which currency is more likely to be accepted by everyone in 10 years? It's bitcoin. So as long as people want to live in a home, you have to convert to fiat first. Unless bitcoin dies, monero can't be the answer. Money is a winner take all game. History supports this view.