Jerry, re the two currency system. China has that now. I'm not sure (really don't know) how well it works for the people who are forced to use it. Big control issues involved in this, mine and theirs.
It seems like something intended to benefit the government which issues both...
That is true even if the internal currency is issued by our own states.
There is (opinion) no easy solution, but I also see a need to have international exchange currencies (right now, there are three (US Dollar, Gold and to a lesser extent, Silver). I notice that quiet a few governments are stockpiling Gold...