I agree with the desire for more "diorama" type pieces. They can be pretty neat and add a lot of depth and dimension to a display. At the same time, however, I can see where Hasbro may have some reluctance to make those sort of pieces. They often tend to be costly and sell poorly, particularly compared to the action figures and vehicles. Look at the mixed reactions that Lars Homestead set from Toys R Us got a couple years ago. It sure was a lot to pay for a plastic shell. I want to say there are even still one or two to be had at at least one of my local Toys R Us stores...
For a comparative example from another toy line, during the heyday of 21st Century Toys super-realistic Ultimate Soldier 1:18 scale Xtreme Detail military line, they released a set or diorama pieces at Toys R Us stores, consisting of a bombed-out house, brick building, barn, and a fountain. Each set came with the various building parts, a figure or two, and other accessories. For any military diorama, they were fantastic pieces, but they were pricey and turned out to be very poor sellers, with most just rotting on the shelves at Toys R Us. Diorama pieces just didn't have the appeal that the planes, tanks, and soldiers had and after a couple years, what remained wound up getting sold off at severe discount.
Even with the wider appeal that Star Wars environment or diorama items would have, I doubt they would sell all that well in the long run. Would they be cool as heck? Yes! Would they be a good investment on the part of Hasbro? Probably not.