Well, as much as I appreciate Mike - his series "The Secrets of Money" is one of the best I know on this subject - he is saying this for years already.
And I assume the central banks will do everything to avoid the use of physical gold and silver. Simply because its near impossible to lie and cheat whit that. If you pay with gold its just - either you have some, or you dont. No "theoretically" or "on paper", its bare facts only. And with such rules the banks are in trouble.