That's a question about demand. My goal is to move all resource extraction and heavy industry off-Earth, and to open the space frontier to permanent and self-sufficient human settlements. For that many, many Starships will be required.

Note that the killer feature of Starship, IMHO, is in-space refueling. This isn't a Earth-based heavy-life vehicle... it's a re-configurable spaceship able to explore the entire solar system through fuel depot staging (with Starships themselves serving as both tankers and fuel stations).