SBD is an experiment to create a counter-party free crypto token without price volatility. However, despite not having a single counter party, the token does have risks, which is why the blockchain stops creating them at certain market thresholds. One premise for their existence is that only enough needs to exist to support a specific purpose, such as backing some niche market in Africa that demands price stability. And when that purpose is met and demand for SBD goes up, the value of Steem should go up and more SBD will be created to meet that demand. In essence SBD has been brought into existence to a point, but it will no longer be brought into existence so freely because printing for printing sake is not sound economically - constant printing would add to the system's debt and increase risk of peg failure. Nothing regarding blockchain-level conversions or exchange of SBD has been changed in the GUI, however.