I believe there are enough pressures to devalue SBD. As the Steem dollar rises, the SBDs being minted increase. I think the pumping has to end once there are so many in circulation, and it will eventually fall back down. I don't think it needs any more manipulation. And I agree with @agroed that it will hurt the platform's growth in the short term, and I also think it can potentially devastate the price of Steem by association as SBD crashes.