Certainly the value of bitcoin will continue to increase over time, but remember that nothing is stable forever, there will be times when it drops down then continue to increase. You can buy more bitcoin when it is discounted.
Ever since im being one of active trader of bitcoin one of the consistent thing about it is change. Change when it comes to its price or value because what I mostly observe about it is its constantly changing because anytime as we observe price are getting high or it is dump. But then of course let's still expect that its price will getting increase but it also drops to some low price