Great post, JR. I think it's important to note that while you do present a compelling argument for bitUSD through your comparison with fiat USD, this is simply setting the stage. You make a subtle yet important point where you said, "The holders of bitUSD retain allodial title to one dollar's worth of bitshares - a cryptoasset with a fixed supply."
So, not only is the bit asset backed (potentially over collateralized in some perspectives), but its protocol (another sources of value) carries the fixed supply parameter. Obviously, this just skims the surface but clearly there is a lot of potential in bitUSD.
RE: What is Money? Pt. 2 & bitUSD as Sound Money