It's almost too simple a thought but I'll post it here anyway..
It struck me a good route to marketing bitUSD; bitGDP etc will be to pitch at existing cryptocurrencies users and play into the idea that Bitcoin and other cryptocurrencies are volatile. Putting those bitAssets forward as a shelter from volatility, even if that is to cover a temporary fear of a coin's price falling, might be an easy way to encourage those already into crypto to see the advantage of a stable cryptocurrency.
One step beyond is then alerting them to the idea that if the USD caves then shorting that might be bring faster rewards than holding another coin whose real value is still too tightly bound via BTC into the USD.
Getting bitAssets considered as useful in the real world might follow more easily if they are already being used in a way that has people consider them as equivalent to digital fiat.