Is there really anyone that thought that Disney would put real peanuts in the ground? You realize that you can't walk on real peanuts and expect them to not break, right? If they were real and under plexiglass they would be harmless but I doubt that they would keep their fresh look.
I understand the concern over real peanuts but it would seem to be more worrisome that restaurants serve foods that include peanuts and that you are surrounded by tons of tourists who may have eaten something made with peanuts. I can't imagine being so nervous about what clearly are fake peanuts.
Unless you are four years old!