We'll just have to change things up, there's barely any buildings as is, no different from New Leaf where you'd also unlock buildings and PWPs overtime and find ways to incorporate them, and move things around.
Only difference is that we don't know what's coming later on which is frustrating, but oh well.
I suppose they could add a second floor to the airport, but it wouldn't make sense, and again the town needs more functional buildings imo.
(Or they could just have you go to bed, and be transported to a dream version of the dreamsuite where Luna could be).