What? A person who has not knowledge in investment the best option would be bitcoin? I guess that is not applicable, because as long as there is investment and money involve a person must know first and learn on how he is going to take things seriously with it. And if doesn't have knowledge in investment then it is better if he will just save his money.
There is no guarantee that price will go higher in future it may go down to minimum too and its not smart to invest all our money only in bitcoins as if bitcoin disappears in future then we will be loosing all our money in one shot so to reduce the risks its always good to diversify your investments.