It will be much sooner - my guess is as soon as 2020
How do you figure?
By design the difficulty will adjust up or down to make the last 0.00000001 BTC arrive in about 2140. Why would you think that the algorithm would be off by more than 100 years? On or two years off one way or the other, maybe. 120 years off - no way.
You seem so sure of yourself. Either way youre probably going to be dead by the time it happens so either way you wouldnt pay up!
Yes, we will all be dead by then. My point exactly. I can make all sorts of claims and predictions about what is going to happen over 100 years from now and, since we will all be dead by then, these predictions that far out do not matter.