I think we will see $500k hit for the first time in the second half of this decade.
$1 million will first be hit in the early 2030's.
$2 million will first be hit before 2040.
We don't know how the world revolves also what will be the economic state in future and we need to consider that before we can conclude or drop some prediction on what will happen to the price in the future. But since bitcoin still unpredictable maybe the best thing we should discuss on what will be the closest figure will come in future and what will be the scenario if all bitcoins will be successfully mined since we never know if the price will pump or dump after that.