If you have extra money right now better to buy bitcoin now because for sure the price of bitcoin will increase more so if you invest now you can gain more profit ..
Some people are even so much confident about bitcoin investment that they have sold their house for trading bitcoin,, they think that they can buy a more big house with the income that they can get from bitcoin, i think there is no doubt that bitcoin has good potential but still we can not any thing for so much sure. I think that we should only invest such amount of money in bitcoin that we can afford to lose.