The value of bitcoin will keep on growing till the halving occurs, but after halving there are many possibilities that the price will drop down significantly.
I think that will happen only in short term. People will sell after the big event halving has happened and more will sell because others sell. But the market doesn't change - less inflation means higher price with same demand.
As you can see you see that the value is going to be more and more slowly and that is perfect for the people that is going to use Bticoin because they want to earn some profit.
And that is logic and also their main reason why they bought it.