Perhaps he ought to just predict Christ coming every day. That way he cannot miss.
It might be one thing to predict it once and miss but Camping seems to have an unlimitted number of chances to get it right. He is,... or ought to be... the laughing stock of Christianity. Most predictors after missing the date once or twice have the sense to believe the Scriptures where we are told that no man knows the day or the hour but Camping is milking the financial cow because people are so gullable.
If he really believed his predictions he would not only sell the radio station but to show his confidence he would GIVE IT AWAY ! Now that would be a show of faith in his predictions.