Steem dollars have no defined role in SMTs. There is no connection.
The only thing that SBD buyers know that some here do not know is that the mechanism is broken and does not effectively enforce an upper price bound. Therefore it makes perfect sense to buy it above $1 if you think it will go higher (and history has shown perfectly clearly that going higher is not only possible, but plausible).
How will we buy SMTs and when people buy SMTs what is the stable token going to be? Why woudn't SMTs increase demand for Steem Dollars?
There is no stable token defined in any part of SMTs. You will buy SMTs with STEEM or possibly with SBD or with other SMTs , but there is no special role for SBD in the design.
Another SBD myth dispelled. Thanks again @smooth :)