I am not sure what will happen to the SBD - I think nobody really knows. there is a constant downward pressure on SBD that will never go away. However, if people continue to buy it at these rates then it will stay there for a while.
It is great for Steem because people start powering up their SBD revenue buy trading it into Steem.
I think for now this is bringing more people to Steemit because they see that we all make a fortune every single day. it also increases the posts and comments frequency - which is always a double edged sword.
All in all I am super excited to see that things started to move up. As you said, people talk about a $4 Steem price for the end of this year for quite a while now. However, i am glad that it hit at least $2!