There are already threads about Tesla's need to add more sales and service locations to accommodate the huge influx of Model 3s. Another consideration is their need to increase their store floor space in order to display a Model 3. My local store (located within a mall) currently has a Model S and a "skateboard" on the floor. They may be able to squeeze in a Model X once they get a display model. There's no way they can comfortably display a Model 3 as well in their current store space. So, in addition to building more locations in the next couple of years, they'll need to scout for new locations for some of their existing stores.