Correct me if I'm wrong, but the SBD is intentionally pegged to the U.S. Dollar. It is not designed to be a currency with unlimited upward potential, but rather to stay close to one dollar in value so newbees won't have to struggle with wild fluctuations of cryptocurrencies and doing a lot of math in their head to figure out what a cryptocurrency is worth.
The $5 SBD either represents incompetence by Steemit.com developers, failure of the design to maintain a value close to the Dollar as planned or market forces that are greatly distorting the value of the SBD and twisting it out of it's original purpose. None of these scenarios form a good basis for rational investing in SBD.
As to the question of whether SBD will go to $5, I would not be surprised, considering the anarchy that reigns around here.