If bitcoin is meant to be a currency, how does the idea go from investment (future growth) to everyday uses, given the extreme volatility of the "price" of Bitcoin. If today a pizza costs me .002 BTC but next Friday is costs me .005 BTC, why would I take that risk on price volatility instead of fiat currency?

How do you see purchases with BTC evolving over the years as the masses adopt the idea of cryptocurrency? Will BTC always be the "gold commodity" and other crytocurrencies with less volatility will be the everyday currencies?

Thoughts?