Bitcoin is not for everyone. It is extremely volatile and very speculative. Arguably, the trend towards higher prices will continue, but at some point there will be a crash. I think the crash -- the big one -- is a long way off, though. Diversification is key.
Ir is true. You really have to diversify your investment in order to truly maximize your profits. By doing this, you actually are playing the safest bet in case a crash happens. So whenever you feel like coming back and reinvesting in bitcoins, you might want to put your eggs on other baskets as well.