This question is generated by genuine curiosity and is aimed at provoking a bit of light discussion. It's not meant to be a trap or a clever argument for Calvinism.
When listening to some of Dr. William Lane Craig's webcasts about Calvinism and Molinism recently, I noticed that he said again and again that he believed that God's plan for the cosmos was to allow the maximum number of people to freely come to salvation in Christ. This was also part of his response to the problem of evil. If men are free to accept or reject salvation and God needs to do whatever is necessary to ensure that the greatest possible number of people choose to accept salvation, then it isn't that unreasonable to assume that God uses evil to bring about that state of affairs. Many people who would not otherwise to turn Christ will do so in the face of pain.
Fair enough. But I'm curious: If God's plan is to get the maximum number of people saved, then why would He ever return? After all, if He had returned 50 years ago, I and other Christians of my generation would not be saved. Likewise, if He were to return tomorrow, countless millions of potential Christians will never be born. In other words, if God truly desires the maximum number of people to be saved, doesn't he have to let things go on like this for eternity?