ANGRY BIRDS MERCHANDISE

Yesterday I went to look for a gift for a little girl who would be celebrating her tenth birthday today.  I heard her mummy say that the girl wanted an Angry Birds pencil case and other merchandise related to these grossly famous Birds.  To my surprise, the shop that I went to was well stocked with Angry Birds Merchandise.  There were bags, stationery, fans, key-chains and so on.
I wonder how long this Angry Bird fad will last?  My guess is until some cute new computer game characters knock them off their pedestal.