That's silly. San Francisco isn't the first city to boom. Detroit added more than a million people between 1910 and 1930. Brooklyn added a half a million people per decade in the early 1900s.
And neither of those cities look like Midtown Manhattan or Tokyo or whatever else SF residents seem to imagine is required to support fast growth.
They did it by building vast areas of multi-story mid-density mixed-use developments. There is zero mystery here, both about what was clearly starting to happen in the SFBA 30 years ago and what should have been done about it.