The originally envisioned peg of the SBD to the USD has long been debunked. It's nice to see it trade and its value be determined by the free market; the price has held well above the experimental "peg" once it got listed on Upbit in November 2017.
The Steem Witnesses can't counteract this and quite frankly, in light of all of the controversy and official scrutiny surrounding Tether, I would argue that any tools at their disposal to insinuate that they are capable of doing so be removed entirely.
SBDs should be represented accurately to Steemit users and the general public as a token derived from the Steem blockchain whose value is determined by supply and demand forces and nothing else.