The iPhone has simply been too good of a business. And it’s hard to see what tops it. Certainly in the near term. If Services is to carry Apple in the future, it will likely be only after years of relatively stagnant iPhone revenue growth mixed with a rising overall market. In other words, time and the broader world will have to catch up. And then Apple can have their “Microsoft Moment” — a services-based resurrection of growth.

Source: Apple’s Precarious and Pivotal 2019 – 500ish Words