I have an ACDC Pro LED and that little wire is there but the end is formed into a small circle. I see little chance of it damaging the play field, but have to admit when I first saw it I thought something came loose on the game (I'm new to pinball so didn't know if this was just a part out of place).
I have had others over that have asked the same thing. However after playing a short time it is easy to figure out that this is to prevent drains from the bell or even just coming down off the bumpers.
If there was a cleaner more effective way to do the same thing besides having a wire sticking out randomly, I would do it. Bigger rings on the posts on both sides make sense to me...can one be added to the post holding the plastic up?