The Steem Dollar's fate is tied to the Federal Reserve and may die on its own.
That is a realistic possibility.
So one obvious solution is
1.to use only STEEM and SP...
2.what about giving the option to let users (market) choose between more than one bitasset, like steem-gold, steem-euro, steem-bitcoin etc. Is there an easy/simple way to give a plethora of bitasset choices?
A simplier solution is to put a floor on the ratio of USD to one of those other assets or a basket. If USD fails due to hyperinflation, SBD would automatically switch over to the other asset(s) and remain useful. This avoids having to create a stock market environment with even more assets that doesn't fit with the simplicity and user-friendliness that Steem is apparently going for.
It is similar to what Dan was saying is going to happen now if USD fails, except instead becoming tied directly to STEEM (which I personally believe will continue to be extremely volatile for a very long time) would tie to another stable value asset.
Cool. I remember Dan mentioning such a possibility.