I hope that if they implement housing with the Guild decoration system as base, they also make the decorations scalable in size.
Housing would increase my time spent ingame. Implementing a „visiting“ option to see other houses as well as a templating function to save and share player houses could even create a community based around that, just like in PoE.
The resources could be spent here perfectly. I haven‘t seen any other „new“ system besides housing being suggested that appeals to me.