Yes, SBD has experience a significant decline recently. After reaching as high as $13, SBD is down to between $5 and $6. This directly influences rewards for the entire community. There is debate about whether the decline is good or bad. On one hand, creators are better motivated to create valuable content if rewards are higher.
On the other hand, some argue that higher SBD is not in line with the initial goals of the currency setup.
Regardless, here's ONE THING you can do in the meantime that will be good for everyone, including yourself...use some SBD to buy STEEM and power it up! I just did this using the internal market.
With the current uncertainty about the immediate future path for SBD, I can do something with a certain outcome: Reinvest in the community and increase my ability to reward creators and curate content on the community.
After buying the STEEM on the internal market, I powered it up and have no increased my influence in the community.
Remember, the decrease in the market value of SBD is not a realized loss for you until you sell at those lower values. If you wait, or better yet, power up, you have not lost anything.