Each upgrade only comes out with a slightly better camera . Better just hanging on the phone for 5 years before upgrading again.
Kuo estimated that sales of all four iPhone 16 models reached about 37 million units in the first weekend after Apple began accepting pre-orders, which is down nearly 13% compared to first-weekend sales of the iPhone 15 series last year. The analyst said a key factor for the decline is the lower demand for the Pro models, with first-weekend sales of the iPhone 16 Pro and iPhone 16 Pro Max estimated to be down 27% and 16%, respectively, compared to iPhone 15 Pro and iPhone 15 Pro Max sales during the equivalent period last year.
The standard iPhone 16 and iPhone 16 Plus have seen higher demand than the iPhone 15 and iPhone 15 Plus during the first weekend of sales, but this has not been enough to offset the lower demand for the Pro models, according to Kuo.
https://www.macrumors.com/2024/09/15/iphone-16-pro-demand-estimate/