In despite of why SBD should be pegged, the system does not work as it is designed.
If it would work like it is designed then you might want to consider to hodl your SBD. Cause when the Steem price drops below $1 you will receive more than 1 Steem for each SBD. Did you consider that option?
I personally believe that the SBD price will keep decreasing of the whole crypto market keeps decreasing.