Steve Jobs spent nearly a decade as CEO of both Apple (AAPL) and Pixar (DIS)—but don’t expect Dorsey to follow a similar trajectory. Not too long after payments technology company Square goes public, Dorsey will leave the company, while staying on as permanent CEO of the other tech giant he co-founded, Twitter. As a newly public company, Square needs a seasoned chief who can weather Wall Street’s demands for growth, says Sucharita Mulpuru, analyst at Forrester Research; Twitter (TWTR), on the other hand, needs Dorsey’s design and product expertise. (One possible successor to Dorsey at Square: Jacqueline Reses, Yahoo’s (YHOO) former chief development officer, who just joined the company.)

This article is part of the 2016 Fortune Crystal Ball, a package of 33 predictions about business, politics and the economy by the writers and editors of Fortune. To see the entire package, click here.