I think that volatility in doing business entails a very big risk, so there should be price stability for Bitcoin.
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It's like you don't even read the posts you're replying to...
...Why run the risk of missing out on making a profit if bitcoin starts to take off just because you wanted to spend it on computer equipment at Newegg or something like that?
IIRC during the first big pump of 2013 to above $1,000 number of bitcoin purchases went up as well. It make sense, people tend to cash-out at least partially, when they think pump might have reached its peak, and buying stuff with bitcoin is just another way of cashing out. ie. when you plan on buying specific item with your gains, instead of going BTC-->USD-->item, you could go directly BTC-->item (and save up on trading fees).
The biggest (by far) reason people don't use bitcoin as a currency, is lack of people earning regular (or any) income in bitcoins, and no one seems willing to go through the hustle of buying bitcoins just to spend it - there would have to be solid incentive for that.