there's an easy solution to make the SBD/USD peg more accurate.
The "reverse converse" proposal by @timcliff :
https://steemit.com/sbd/@timcliff/saving-sbd-proposal-to-restore-the-usd1-usd-usd1-sbd-peg
The original Steem White Paper warned against it, but Steem has changed since then and "reverse converse" is not exploitable anymore as @smooth explained:

"in the system as it exists today, if someone were to convert STEEM into SBD and produce a large amount of SBD, it would no longer be fully convertable into STEEM, either immediately or after a price drop. The whales in the above-described situation would end up with 50% less STEEM than they started with, obviously not a very attractive 'exploit''