Bitcoin won't go up forever. By it's own definition that it is a currency, the end game is for bitcoin to have a stable price once adoption reaches equilibrium. It could be a very high price but not a forever rising price. No point predicting what it will be, pretty much impossible to predict.
yeah, for us simple bitcoiners, it will really hard for us to predict of there would be a final price for bitcoin, and I would agree that not all the time bitcoin price will rise. It will also dump some of the time. Just like what happen for the last time.
Yeah... we saw that a few days back when the exchange rates dropped from $4,500 to $2,900 as a result of the China FUD. But the good thing is that the prices recovered in quick time, and now we are back at $4.5 K. A reason for this quick recovery, IMO may be the fact that Bitcoins are under-priced right now. After all, there are only around 16.5 million coins available in the market.