Will never happen. Can't see it staying higher that say 300/400 for any length of time. if it did it would price the normal person out of bitcoin as a currency. It would be bad for 95% of users if it were to go that high..
Anything can happen in bitcoin and it will also happen, but no one knows that when will it happen, But I am sure when all of the bitcoins are mined and every person of the world adopt and use bitcoin then I think at that time that amount will be reached.
It could happen but we all know that it is not going to happen, we know that if the price would it rise to a million everybody would sell there coins.
I even think that people would sell all there coins before the price even reached a million they would already sell at $100,000 for example.