Nope, you’re right that the 16 Pro will start at 256GB for $1099, but the Pro Max will remain at 256GB for $1199.
My assertion? Apple is looking at introducing a third line of iPhones in the next year or 2.
iPhone/iPhone Plus
iPhone Pro/iPhone Pro Max
iPhone Ultra/iPhone Ultra Max
iPhone is the 1 device that people will pay a premium for now matter what. Look at the evidence we have presently: the iPhone Pro Max is selling greater than it ever has relative to the others. This is proof that people are will to spend exorbitant money for the most feature-rich phone.
This leads me to believe Apple will introduce the third line: iPhone Ultra which will include exceedingly expensive and cutting edge tech that is very early and therefore lower yield. For example, the iPhone Ultra could get microOLED displays 2 years before the iPhone Pro. It could get another camera, even faster screen refresh, brightness, etc.
Moreover, Apple just released the A17 Pro for the iPhone 15 Pro.
How about A18, A18 Pro, A18 Ultra? Remember, there is precedence for this in their M-series Chips as well.