At this time, the success of Bitcoin is driven by speculation not its use for payments. Speculation is most profitable when the markets fluctuate a lot, and less profitable when the markets are stable. In a (rather small) economy like Bitcoin, it is still possible for a few players with lots of liquidity to move the market at will, so please do expect a lot of fluctuation when MtGox comes back. It will take a while until MtGox will regain trust, but once that happen, the bubble will return. Ride it wisely!