Not only can the price of Bitcoin go down in the future, but the price of Bitcoin can go up a lot in the future. But no one has control over the market so you can't say with certainty that the price of Bitcoin will decrease in the future.
There's this thing i know, that after the next year bitcoin halving, we are not going to have anything below $68,000 after which the new all time high has been achieved, which also includes that bitcoin is ever increasing in value and always demanding being a currency, the reason why it's volatile is to have both the rise and fall while it continues to increase in value over time, while it price keep pumping and dumping.