They need to do something to ensure the crispness of the Taptic Engine doesn't degrade so quickly. My Apple Watch suffers from this, and over the past 8 months I've noticed by 6S doing the same. It is a much less noticeable pop.
As for the design cycle, I think three years makes sense, especially as the iPhone is abstracted down to just glass and metal with few buttons or ports. The iPhone this autumn might be called the iPhone 6 SE. Or they might just get rid of the 6 altogether much like they did with the 5 on the iPhone SE. But then I'm not sure how they would distinguish it from the iPhone SE unless they just call it the iPhone and iPhone Plus. The iPhone SE should have been called the iPhone Mini or something. Apple's naming is anything but consistent. For a company that obsesses over every tiny detail—even buying a mountain to make sure the floors in each Apple Store look the same—they sure don't seem to spend much time thinking through what they call their devices.
I wish they would just do this:
iPhone Plus 32/128/256GB starting at $299
iPhone 32/128/256GB starting at $199
iPhone Mini 32/128GB starting at $99
Then have iPad Plus, iPad, and iPad Mini since the iPad really can't be considered "Pro" at this point. Then consolidate the MacBook Air, MacBook and MacBook Pro 13" (because honestly, there isn't a huge performance difference between them except for the kinda slow MacBook) and just call them all the MacBook with a unified look and good performance, and then have the MacBook Pro at the 15" size with it's discrete graphics card and give it a higher-end RAM option. Then have the iMac and larger iMac Pro with discrete graphics and higher-end RAM option. Give the Mac Mini some respect, even if it costs more (like $899 or $999 with at least a quad-core chip and middling discrete graphics), call it the Mac and then have the Mac Pro at the top. Let the Mac at least have an upgradable SSD and RAM. Then just have one iPod Touch model, rename it the iPod, and then have the Mini version of it that is just for music and could maybe even stream Apple Music with built-in WiFi. Get rid of the Apple Watch Edition, and add a version of the Apple Watch with a larger display (46-48mm). Keep a budget version of the Apple TV that runs TVOS, priced at $99. Perhaps it could be the current gen when it gets replaced. Then have a high-end gaming version that can playback 4K video, called the Apple TV Plus. So, to recap:
iPhone Plus
iPhone
iPhone Mini
iPad Plus
iPad
iPad Mini
iPod
iPod Mini
Apple TV Plus
Apple TV
Apple Watch Sport in 38mm, 42mm and 46 or 48mm sizes
Apple Watch in 38mm, 42mm and 46 or 48mm sizes
MacBook Pro
MacBook
iMac Pro
iMac
Mac Pro
Mac
I feel like you only need two versions of each iPod and each Mac. Keep the Plus naming for the iOS based line, and keep the Pro naming for the Mac OS based line. One of the many things that was bringing down Apple before Steve Jobs returned was they lost focus and had too many product lines. They need to reduce back to a manageable level. And if they really want to do a "Pro" iPhone, just have it as a build-to-order option where you get an improved camera, more RAM and Apple Pencil Support for like $100-$150 more. But that's still kinda tricky.
As for the design cycle, I think three years makes sense, especially as the iPhone is abstracted down to just glass and metal with few buttons or ports. The iPhone this autumn might be called the iPhone 6 SE. Or they might just get rid of the 6 altogether much like they did with the 5 on the iPhone SE. But then I'm not sure how they would distinguish it from the iPhone SE unless they just call it the iPhone and iPhone Plus. The iPhone SE should have been called the iPhone Mini or something. Apple's naming is anything but consistent. For a company that obsesses over every tiny detail—even buying a mountain to make sure the floors in each Apple Store look the same—they sure don't seem to spend much time thinking through what they call their devices.
I wish they would just do this:
iPhone Plus 32/128/256GB starting at $299
iPhone 32/128/256GB starting at $199
iPhone Mini 32/128GB starting at $99
Then have iPad Plus, iPad, and iPad Mini since the iPad really can't be considered "Pro" at this point. Then consolidate the MacBook Air, MacBook and MacBook Pro 13" (because honestly, there isn't a huge performance difference between them except for the kinda slow MacBook) and just call them all the MacBook with a unified look and good performance, and then have the MacBook Pro at the 15" size with it's discrete graphics card and give it a higher-end RAM option. Then have the iMac and larger iMac Pro with discrete graphics and higher-end RAM option. Give the Mac Mini some respect, even if it costs more (like $899 or $999 with at least a quad-core chip and middling discrete graphics), call it the Mac and then have the Mac Pro at the top. Let the Mac at least have an upgradable SSD and RAM. Then just have one iPod Touch model, rename it the iPod, and then have the Mini version of it that is just for music and could maybe even stream Apple Music with built-in WiFi. Get rid of the Apple Watch Edition, and add a version of the Apple Watch with a larger display (46-48mm). Keep a budget version of the Apple TV that runs TVOS, priced at $99. Perhaps it could be the current gen when it gets replaced. Then have a high-end gaming version that can playback 4K video, called the Apple TV Plus. So, to recap:
iPhone Plus
iPhone
iPhone Mini
iPad Plus
iPad
iPad Mini
iPod
iPod Mini
Apple TV Plus
Apple TV
Apple Watch Sport in 38mm, 42mm and 46 or 48mm sizes
Apple Watch in 38mm, 42mm and 46 or 48mm sizes
MacBook Pro
MacBook
iMac Pro
iMac
Mac Pro
Mac
I feel like you only need two versions of each iPod and each Mac. Keep the Plus naming for the iOS based line, and keep the Pro naming for the Mac OS based line. One of the many things that was bringing down Apple before Steve Jobs returned was they lost focus and had too many product lines. They need to reduce back to a manageable level. And if they really want to do a "Pro" iPhone, just have it as a build-to-order option where you get an improved camera, more RAM and Apple Pencil Support for like $100-$150 more. But that's still kinda tricky.