You are treating Bitcoin like it's a standalone economy/currency. If anything it's there to compliment the dollar, euro, yn, or whatever. It's never going to replace these currencies worldwide, like some of the paranoid libertarians here like to preach. But it's a great alternative.
So yes, BTC's value compared to other currencies rises, but you could also say that about the value of a nice house in a growing part of town, or any other investment. The difference is you can't trade 0.3 of your house for an Xbox.