Your scenario assumes the old guard (bankers) want cryptocurrencies to fail...

Quite the opposite. The bankers will become anonymous whales of Bitcoin (like satoshi and the other whales).

So our new money supply will still be manipulated, only now it will be done by even more anonymous parties. I kind of think this is scary because at least with a central bank, the people can eliminate it through legislation (happened many times over US history, and will happen again if the Federal Reserve proves incompetent). so Bitcoin could turn sinister.