Hostess and “Free Wacky TV Show Cards”

This advertisement for Hostess Cup Cakes and Twinkies reminds me: What happened to the days when snack, cereal, and other food manufacturers would print trading cards on their packaging? As a kid, I always loved the fun of cutting out and collecting the cards, and this ad has me wondering: Do kids today just not care at all about physical collectibles like trading cards, or have the food makers simply stopped trying to appeal to the kids?