It is being hyped up on 80" TVs, not 5" phonesThose kind of resolutions, including much smaller 2K (for ex. on G3, and note 4) are just that... hype;pure marketing. 1080p (on Android devices not using pentile) is more than enough (unless we're talking about tablets). Personally, iPhone's 326 ppi is good enough for most people, including me (and no I'm not 60 years old). It will be even better on a bigger screen (4,7"). If they were to increase resolution to 1080p, it would also be fine (if developers are fast enough with app updates). Anything more (on a 4,7" iPhone) is just stupid and wasteful.
And what makes you think that ppi will go down in the first place??
No, firstly 4K is being hyped up on computers including the Mac Pro and computer monitors, did you not watch the Mac Pro keynote? It is also being hyped up on Netflix and 4K TV's are from 50" not 80".
Like this:
4K performance that’s nothing short of spectacular.
Work pixel-for-pixel in 4K without slowing down, thanks to dual AMD FirePro workstation-class GPUs and the latest Xeon E5 processors in Mac Pro — a merger that delivers the breathtaking capability to run eight picture-in-picture streams of 4K video at once in Final Cut Pro X (or many more streams of HD video). Combine that with the power to drive up to three 4K displays and process multiple layers of complex effects in real time, and you have a video editing powerhouse.
From here:
http://www.apple.com/uk/mac-pro/performance/
I also never once said 4K on phones was being hyped up, I stated what is the point in 4K if people on here don't want higher resolutions? And as I stated it's because it gives much much much finer detail and that's the same with a phone.
I like your generalisation as a fact, even though it is your OPINION, that the iPhone is 'good enough' for most people. Well that's clearly wrong as 'most people' in this world do not own iPhones do they, most people would basically mean the majority of the market.
You clearly have not used a big screen high res phone, if you had then you would realise just how much difference it makes. But if you would be happy spending $700 on a phone with sub 1080P screen in 2014 then be my guest.
And 326PPI would be worst on a bigger screen not better. It would be more pixelated. Also the PPI going down is because of all these 'opinions and rumours' of it doing so.