I do not like hard currency systems, but if you are going to have a hard currency system you should do it right. Its virtue is that it is simple and robust. There is no way to break the bank by having a currency run. Hybrid system between hard and fiat money tend to have contradictions that causes their collapse.
On to your points.
MO is just physical cash. You also need to factor in the monetary base – what banks keep in the vault or at the central bank – the non-fractional part of fractional reserves. That would also need to be replaced.
http://en.wikipedia.org/wiki/M...
For a gold back standard to work a country must able (or appear able) to swap currency with gold, which means it is tied to the world price of gold. People have tried various methods to get around this.
One could revalue the dollar vs. gold, which really means devaluing, which means debasing, which just causes inflation and does not get you anywhere. Remember, the value of all dollars should be the same as the value of your gold in your vault.
People have tried to game the system. The problem is that when people call your bluff and you can’t ante up, your currency collapse.
Most hard money types consider FDR’s action the first step off of the gold supply. Also times were different then. The US had much more gold in stock relative to the economy and the economy was less global. Not so much today. Plus FDR was sitting on the biggest supply of gold. As the 800 pound Gorilla nobody nation could called his bluff.
There are other ways to bluff the system. Cranking up real interests is one but that hurts the real economy. On can restrict currency conversion (holding gold, exporting gold, or importing anything else.) to have a closed system but that has serious implications. See Venezuela today. There are many other examples back in the 70s and 80s. Countries have tried to get away with holding only fractional reserves or dual reserves (Gold and Silver) but when these system are tested they hold up until they crumple like a pop can.