SBD seems to have a bigger ambition that that. According to the whitepaper, 
> Because stability is an important feature of successful economies, Steem Dollars were designed as an attempt to bring stability to the world of cryptocurrency and to the individuals who use the Steem network.

EOS will have another new version of dollar pegged token? I think Dan just wants to experiment a different mechanism of dollar token whenever he starts a new project. :)