Id be okay with a modelling Stuff Pack or something but it has to be a little more than just walking to the bottom of a runway and striking a pose. I'd want something a little deeper in terms of gameplay. Magazine/brand deals, in game billboards and posters with your Sim on it, that kind if thing. It could integrate well with the Celebrity feature already in the game. At a push they could do a Game Pack with a new career path and a couple of new lots or something but it would be very niche... but they've done niche before so why not...