The market doesn't believe SBD is $1 because there is no monetary policy committee behind SBD trying to help peg that, there is no smart contract like the dai or any dollar backed bank account like Tether, SBD is largely just left and not managed in any way and we expect it to be pegged with no effort

smart contract i think is the right solution. If the Blockchain itself fix the Problem and exchange, that would be better.

Is it possible we replace SBD code with a dai copy for steem? because i think dai works way better.

That would be a great proposal i would support :)