Q1 2018 revenue: iPhone: 61.5bn USD, others 5.5bn USD (Apple TV, Apple Watch, Beats products, iPod touch and Apple-branded and third-party accessories.) Even if it is a novel idea it is still pretty insignificant for the bottom line.

I think when a product line crosses the $1B threshold (ATV, Watch, iPad), it's still a successful product despite being dwarfed by the iPhone.

Think of all the other technologies companies that are currently dwarfed by the iPhone's sales: Tesla, SpaceX, Blue Origin, Microsoft, Google, Netflix, etc etc. Are these all insignificant? Nope...