Bitcoin is designed in a way that it will never stop going up as long as there is demand for it, and in 2030 the total supply becomes almost reached:

As you can see, the curve becomes almost a straight line. The price should be very, very high in 2030 if the demand is meet. Luckily, we are still early on, notice how in 2017 there is still a nice angle. The more straight the line becomes the higher the price (and the harder to accumulate).
In 2030 If the demand will be relatively the same the supply will be nil casing which will rarify the bitcoin.
I think it's time to invest in the bitcoin prices will only go up.