I think it has to rise slow and steady for it to be sustainable. Otherwise there will be too many people getting in and out.
There are two types of person in this situation, one that's afraid in volatility of the coin and one that's not. For people that's afraid in bitcoin's volatility they won't stay in this currency and stick into fiat, but for people that like the volatility of the coin they will use it to profit like do a trading.
Ya for those who are really experienced and had a good skills of trading can get good profit from this volatility character of bitcoin while others may also loose in trying to do so.
But till bitcoin is rising i am no issue with its volatility.