Certainly bitcoin will continue to rise. Choose the right time to invest in bitcoin to bring the greatest effect. Currently, I think bitcoin prices are stable. You can buy bitcoin at this time to invest.
In future bitcoin price will increase. Thus it is better to invest in it early if at all one is interested in bitcoin. They can hold it later on and get profits by selling away smaller fractions of it in future. Since the price is fluctuating it is better to invest early and that is why I suggest people to invest as soon as possible and not wait. You never know when the price may fall and you might be able to buy some and get into the market for a first time adopter of bitcoin.