Bitcoins are a currency. It only becomes a type of "scheme" if we keep linking it to Fiat currencies.
IF the time comes where WE decide the a BITCOIN is a BITCOIN and people that buy and sell goods for Bitcoins keep fixed prices (accounting for inflation) then the market volatility will go AWAY.
People are treating Bitcoins more like Stock instead of a currency. Until people change the way they use Bitcoins, there will be volatility.