Steem will keep shooting up in value until it is on par with SBD's then it is decision time on what it is going to do. So far I feel a lot of the rise in the price of steem has been from converting SBD to steem since the ratios were so good and SBD's shot up in price.
THere will always be pressure on the SBD's to go back to the dollar peg since that is what it is suppose to be at.