Re: "Premium smartphone buyer"
Technology isn't changing all that rapidly now Moore's law runs out of steam in a couple of years as far as current concept of smartphone goes - improvements should be sufficient to kill most of the remaining consumer camera market as quality jumps a step or two above current smartphone cameras.
Already for what most people want to do current phones ought have a good 3/4 years barring accidents. So yes, agree premium smartphones look like they are on their way out - if it wasn't for US carriers focused on selling expensive contracts that favor premium replacements every two years the trend would already be more visible.