According to my research, the last Bitcoin will be mined in 2140. I thought it would happen much sooner, in 2040. However, Bitcoin reaching a price of $1 million may happen much later. And I think the super bullish moment will happen when the amount of Bitcoins that can be mined is very low. Or serious political changes occur.
The amount of Bitcoin that can be mined is already very low. 1.3 million is left out of 21M for the entire remaining issuance, so that is extremely low.