I don't think having a diverse range of phones necessarily correlates with innovation. The iPhone is boring a lot of people these days but I would argue that is down to the operating system more than anything, as the phone itself while lacking newer features is still a nice looking and solid device.
You have to look at the larger iOS product family, inclusive of the iPads, to see the full picture. I don't think we'll see a larger iPhone any time soon and the older models serve the needs of those who want a small phone.
And of course do not underestimate Apple's upsell strategy. They are absolute masters at placing and pricing to emphasize the more expensive options, or even buying two products. For that reason alone I find it highly unlikely that Apple would offer a more fine grained range of devices like you find from other manufacturers.
You have to look at the larger iOS product family, inclusive of the iPads, to see the full picture. I don't think we'll see a larger iPhone any time soon and the older models serve the needs of those who want a small phone.
And of course do not underestimate Apple's upsell strategy. They are absolute masters at placing and pricing to emphasize the more expensive options, or even buying two products. For that reason alone I find it highly unlikely that Apple would offer a more fine grained range of devices like you find from other manufacturers.