> . It doesn't matter what value BTC has, as long as it is constant.

That'll never happen, bitcoin is doomed by math and economics to be forever a deflationary currency, worth ever more and more over time as the economy grows while the supply of bitcoins doesn't.

If it were to stop moving in the near future, BTC would be stuck at minor-currency status with a $1 billion valuation. I'll be happier if it stops moving with a $1 trillion valuation, so lots of people can use it instead of just a few geeks and druggies.

Huh? Just... don't tip 1 BTC? For example, the bitcointip bot on reddit will take USD values, use the current mtgox price and then tip the equivalent amount in BTC. Of course the person receiving the tip is affected by volatility compared to USD. For now, it's certainly in their favor, and again, it's no different than other currency except BTC's high current volatility.

The volatility of a currency is one of the most important metrics.

It really doesn't matter if a currency is inflating or deflating. It just shouldn't change that much over time. The less it changes, the better. (or, if it is changing, then it should at least change consistently. IE: People expect USD to inflate at 3% so it should).

Since no one can predict the value of BTC next week, or hell... even tomorrow's price of BTC... it becomes a very hard to use currency.