Which toys that are out/been out in the last five or so years do you think will be the toys in future Mumsnet threads about how everyone had one? We see this all of the time with the Mr Frosty machine and other things like an Etch a Sketch, Easy Bake Oven, Cabbage Patch Dolls etc. You can still buy these things but it's not the same as it was the when they came out. What toys that your kids/nieces and nephews have do you think will be remembered like those previously mentioned? The only one that instantly springs to mind to me is Luvabella (and I feel bad because I never bought DD one when they were out 
), any other ideas?