Eh... I really don't like that idea. Yeah, I get the whole security thing, but it would kind of put a damper on the whole fun thing of Fanime.
How would that put a hamper on the fun of Fanime? I see in your sig that you've attended since 2010, so come 2013, you'll have four badges. That's somewhat reasonable, but what about people who've got 10+ badges on their lanyard?
This is more than a security thing, as money comes into play. I saw tons of people quickly flashing their badges to get in, and I've seen some of them who didn't have a 2012 badge. By allowing people to get in without proper badges, Fanime is losing money.
I personally like the idea of a telltale lanyard for every year. That way, if the badge doesn't match the lanyard, off they go.
When it comes down to it, I believe that the badge checkers are the only ones responsible. You guys volunteered for these positions, and you know well how crazy things can get. But Fanime TRUSTED you to do your jobs properly.
Who cares if it isn't always easy? Who cares if the lines are long? Slow down, check those badges, and do your job right the first time. Besides, once attendees get through the badge check lines, chances are they're still going to have to wait to play a game, check out merchandise, etc.