It's 2011.-DNA- wroteRead this http://www.forbes.com/sites/timothylee/2011/08/07/the-bitcoin-crash/
The volatility of the currency has decrease a lot. The reason the currency crashes was because one of the markets still had some security problems (not the protocol itself, but one of the popular exchanges). The exciting thing is, BTC after having reached $30 in the past has crashed into $2 and now has reverted and overshoot to ~$50.
I think it's an early adopter market, and worth investing in. Nevermind the miners, that's a solved problem, and is already marginally profitable for a niche of people. The currency by itself has growth value at the moment.
You'd never know. BTC have a non-zero chance of always crashing if everyone decides to sell. This http://mtgoxlive.com/orders can give you an idea of how much bitcoins need to be sold in order to decrease the value of bitcoins to what...