That means the Steem blockchain design did not anticipate the market valuing SBD more than USD?

A lot of business models cannot be implemented without the stable currency.

How about we redesign the Steem blockchain in order to try and restore the peg in a way that it can be maintained. I have an idea for that in a post I wrote 7 days ago (just hinting it is too old to earn and therefore my goal is more of sharing the idea):

https://steemit.com/utopian-io/@mkdouglas/decentralized-autonomous-steem-central-bank-for-maintaining-the-1-to-1-sbd-peg-to-the-usd