Thankfully we still have FAKE AI!

True AI, should have corrected the question and said something in the lines of, we will see the ramifications of a diminishing block reward around the year 2036 - 2040. In terms of any significant additions of Bitcoin to the network, it will be around year 2052 (5126BTC or 0.02442599%)... We don't need to wait till the last reward block is found. 2140 should be treated as a milestone, if anything...