I think it's more likely that SBD become more and more closely valued to $1 as time goes on. Currently when you go to exchange an SBD on poloniex for BTC, you're most likely trading with someone who's put minimal time into understanding what they're buying (maybe they've watched a few youtube videos on Steem and decide to invest equally in STEEM and SBD cuz "it's pretty much the same thing... right?") and just want to make a quick buck. As time goes on, there will be more and more info out about SBD and people won't be as willing to buy a convertible share of STEEM (which is what SBD is) at a premium. As always though, multiple opinions are better than just one. I may turn out to be wrong!