You are missing the point of how SBD are actually created. Let's think this through:
- SBD price goes down further
- People start to use "convert" instead of selling into the market
- A week later, they get STEEM
- Steem are sold
- The market cap of Steem goes down
- Less SBD are created from posts (because the market cap went down)
- Less sell pressure due to SBD sell-off and convertion due to less amounts available
- Meanwhile people start to understand the implications of SBD (free instant micropayments, interest)
- Buy Pressure for SBD starts to build up again
- Meanwhile the network grows and demand for SP grows aswell
- People buy into Steem to get SteemPower to obtain more VotingPower and higher rewards
- Marketcap rises
- Rinse and repeat until sufficient market traction slows down the process