so you still need brokerage between these with routing between them, accounting for their trustworthiness. not to mention these companies dont specialize in money creation/management.
Bitcoin with colored coins would manage much of this. Since your very interested in this new form of money, this video explains the details.
Sure you can make colored coins but their supplies will be in constant flux. Their values determined by the trust in the issuer (nebulous, difficult to determine) & the number of coins
money "backed by a commodity" just means people are willing to trade money for that commodity at a price. that is already the case for anything you can buy.
Not even close. The Money is a third party utility, while producer credits are priced in money, they are not money itself. This small difference is the key.