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).