Latest 10-K (fiscal year to Sept 26, 2026): iPhone $254.10B vs Services $123.30B, so Services is under half of iPhone. The gap also widened over the year, from $100.43B to $130.80B, as iPhone grew about 21% ($209.59B to $254.10B) and Services about 13% ($109.16B to $123.30B). With three fiscal years left before the close, Services would need to outgrow iPhone by a wide margin every year for this to resolve YES.

Source: Equibles

Would “services“ count as a product line?

(Just depends on your definition. I think this needs to be clarified here.)

The Apple Car is another possibility.

We have a while left before 2030, I think a lot could happen.

https://appleinsider.com/inside/apple-car

Apple Car | Project Titan, Release Date, Price

Is an Apple Car just down the road? Read more about the top-secret project believed to be known as "Project Titan."

iPhone has hovered around 50% of Apple's revenue for ten years.

The likeliest challenger is revenue from Services, which has doubled to 25% in the past 7 years. In my opinion, their focus on visionOS devices makes another doubling of Services seem unlikely.