Makes sense. The thing is mature markets also rely on the currency value fluctuating within narrow ranges. Say, in the plain old currency central banks act (fiddling with interest rates, etc) to keep currency value "stable". Given Bitcoin's decentralized nature, markets will have a hard time trusting it (if ever).
As you said, this is only a qualification of 'mature' markets. Also, central banks do not fiddle with interest rates to keep the value stable. They fiddle with interest rates to stimulate economic growth, which causes instability through bust boom cycles...kicking the can down the road.
