> Who on earth would actually spend any Bitcoins right now? If you'd bought a Pizza with BTC back in 2010, you could have bought a car (or house?) instead only several years later. This type of volatility makes it totally unsuitable as currency.

Will it not eventually stabilise? When it's just starting out and only few people believe in its value it seems inevitable it's going to be volatile in the early days. Some people have to start making the first purchases in the beginning so if people weren't buying pizza and whatever with it when Bitcoin was low in value it wouldn't be valued what it is now.