Ok, interesting Idea, but here is an interesting question:

How does the sell sbd for steem will drive SBD price down? For me It doesnt make sense.

If the initiative would be to drive SBD closer to 1 usd, then this SBD should be sold at exchanges for BTC(or usd is possible), then the BTC should be used to buy steem at the same exchanges, and then back to steemit account.

Trading It on internal market Will only drive the steem price up, wich Will discourage people to trade their SBD for steem, because they Will get less steem/SBD (unless you people are Trading on both ends). Actually this would encourage to sell their steem