What happened to all the "John 3:16" signs at sporting events

A few years ago, a major league baseball game was incomplete without a fan sitting behind home plate with a “John 3:16” sign. Now they’re all gone. What happened? Did they lose interest and move on to some other activity, or did major league baseball get stricter about signs, or what?

Are you talking about Rock 'n Rollen? If so, this is what Cecil says:

The bloke is the subject of two columns by Cecil: What’s with those “John 3:16” signs that people hold up at football games? (1987) and Is the guy who held up those “John 3:16” signs at sports events in jail for life? (1997). I dunno whether there were others, or whether they have lost interest.