day-to-day stability of value
BTc will become more stable once it is more openly traded (i.e. Winklevoss fund).
It will be more stable when the market cap altogether is much bigger, and then news positive or negative will have a smaller effect on the overall value of 1 btc.
Exactly right, the reason $ or £ or yen or euro dont move much is because they have multi trillion dollar market depth, making them move significantly requires massive amounts of trades, like they are ocean going tankers which take miles to turn around, bitcoin is a tugboat in comparison.