Year 2140 is a long time from now. Most, if not all of us would have passed away before that time. But who knows, anything is possible. Man is so smart now a days that he can come up with ways to achieve whatever goal he wants. So man can find ways of speeding up the extraction or mining process of satoshis in the coming years. When this happens, we may even live up to the time the last satoshi is extracted! Now, imagine how much that satoshi would be worth by that time? Well, that would be another topic.