In September 2015, at the height of San Francisco’s Indian Summer, then-Uber CEO Travis Kalanick sat beside Salesforce CEO Marc Benioff in front of a crowd of tens of thousands, on a stage erected in the middle of a closed-off street in the heart of the city, and explained his vision for the future.

Someday he wanted to stand at the top of Salesforce Tower, look down upon a streetscape where every car was an Uber. “If they were, the world would be a better place,” he said. He didn’t say for whom. 

At the time Salesforce Tower was a hole in the ground two blocks from crowds sweating under the jumbotron. Today it is near completion, and Travis Kalanick’s vision has fallen apart...