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If that was true BitUSD would have never been worth less than $1 and it dropped to sub $0.85 for a while.

You might have a look at this video @exyle made today. In summary, there certainly is a way to make the SBD be worth around 1$. But maybe the time is not here yet: https://steemit.com/life/@exyle/6lqofqee

SBD has been at $0.85 as well. I guess the limit is not perfect.(probably dependant on the amount that is backing bitUSD & SBD and the volatility of the currency.)