Perhaps we can get the best of both worlds by waiting until SBD naturally returns to a valuation around $1 (if that ever happens) and then making an adjustment like this, so it has (in theory) no immediate impact.
On the other hand maybe Steem doesn't need an official internal pegged currency - an SMT, or even non steem token, might be a better way to cover that use case.
Take into account that if dollars goes to hyper-inflation, then it could be pain in the ass trying to get all your sbd out before it is worthless.