Looking at bitcoin's price today, it is really a good time to invest in bitcoin because the price has dropped to 7,000$ mark already. But if you can monitor it for a while, the better because it might go down a bit more.
With the volatility and uncertainty in this market though, it has to offer much better returns than the 'normal' world. Otherwise everyone would be better off buying stocks. 100% in 3.5 years is around 20% annual returns; does that justify the risk?