IT'S TIME PARTY!!! :)
I'm not worried. In fact I'm taking advantage and you should be too! 
One reason I enjoy mining during these days when bitcoin is having a huge dump is that when it finally rises once again, I'll have all these fresh coins still waiting for me! I love mining because it really doesn't matter what the market is doing. In fact, a low market is awesome for me, here's why....
A low market also means I can buy some ON SALE (if you will) bitcoin, then wait for it to rise again in my wallet....then buy more mining shares! It's a very good strategy for anyone mining or wanting to mine.
I'd rather buy a $500 mining pool for $250 any day!
That's my strategy and I'm sticking to it! :)