I'm more concerned about BTC stability. I see folks around talking about 1 BTC = 10 USD and that scares me a bit! If BTC becomes so high it will render it useless for business, unless we start to operate with 4 digit at the right of the comma (i.e. 0,0001 BTC).
Stability is good for create business around BTC, whereas instability is good for traders and exchangers... let's see the outcome of it.
You won't really need even a third decimal place until you get 1 BTC = 100 USD. That will be a while, even by anyone's most optimistic imaginings.
Though, I think placing the decimal point where it is was a mistake, in retrospect. If Bitcoin really
gets popular, it will almost certainly have to be moved -- to the right! Though I don't think that will need to be considered seriously until 1 BTC = 10 000 USD.