You do realize that the current price slump in Steem is due to the recent hard fork and the reduce power-down time, right? Steem Power was hyperinflated for months, and then 2 weeks ago they made the change to suddenly release this inflated Steem Power onto the market, causing a dramatic increase in the effective inflation rate of liquid Steem. It will be at least 3 months before this effective inflation stops.

Downward price pressure is caused by people wanting to get out of Steem; whether I get out of Steem via SBD or simply by selling my Steem is immaterial.