My piece of advice? Look how the Brazilian Real came into play. The market was chaotic, with prices in constant upheaval. a loaf of bread could see a 20,000% swing in either direction. When the Real came into play, it reset everything. It was standardized, simple to understand, and people rolled with it. Eventually, the Real became the standard currency in Brazil.
While I don't see SBD ever replacing Steem, the concept is still sound. With an SBD token that is always the same value, it makes trade in Cryptocurrency that much easier. And people can still exchange for Steem if they so desire, allowing people to play the cryptocurrency market if they want. But everyone else can use it like money.
Frankly, I'm all for pegging the SBD to the dollar. Barring some massive deflation in the value of Steem, it's fairly difficult for this to be a problem.