I'm torn. I'd love to see a lot put into an expansion, but I can see the benefit of having dedicated packs to single supernaturals. Something like Witches I feel like NEEDS it's own GP, cause a magic system would need to be crazy diverse and deep, plus they could supplement the pack with an Alchemy skill and a new town - even if it's a small one like Forgotten Hollow.
On the reverse, I feel like Faeries and Mermaids could be lumped together, or as tag alongs in similarly themed GP. Werewolves, too, could be a tag along because there's honestly not been a lot to them in the past games, and so long as there's moon cycles, they can transform and have their silly interactions like shed and chew the sofa. Robots are slightly different, but could be a tag along as well. Personally I ADORED the Plumbots in Into the Future in TS3, and the entire chip system that you could use to trait them and give them autonomy. I think that could be a fun thing to add back to the game, and could easily be slipped in with a science based pack or even as a tag along with a University pack.
