When all bitcoins are mined, the price will rise a wave. Will the volatility of Bitcoin decrease in the future? At that time, only my children or descendants can witness. I just can't see Bitcoin being fully mined.
It's going to be a gradual process.
Every halving we get half the amount of new coins, so we're living through this really.
The new coins will be very few in a decade (3 halvings), and even just now there are less than 10% of the coins to be mined.