While it's pleasing to see bitcoins return to a more sensible valulation, the rapid pace of swings is most concerning for those who want to use bitcoins for serious purposes. It's down almost 50% in a week. What kind of business can tolerate their currency swinging wildly like that when ordering stock and setting prices weeks or months in advance?
Any business that sets prices in fiat. This way the volatility problem is transferred to the consumer. Yesterday I bought something with bitcoins one minute after buying those bitcoins.