The share of iPhone for today's teenagers is much higher than the regular population. Much of it from the natural progression from old iPod Touches, where they built their accounts, apps etc.

Looks like 85% share in the US: http://www.pipersandler.com/2col.aspx?id=287&releaseid=18206

It could be a deciding factor - modern smartphones and tablets are already very skewed to content consumption rather than content creation, and iOS devices even more so with their walled garden & app censorship approach.

While its preatty simple to start coding on a Windoss/Linux PC, Android and iOS devices are not self hosting, you need to download an SDK, set device into developer mode, etc. - a barrier in itself. On iOS it's even more complicated if you wanted to write an app for your iPhone and share it with friends - expensive developer subscription & draconian app review!

So my worry is we will loose a generation of developers who would otherwise get to coding and sharing of their creation on PCs if their first and only device is a locked down cosume-only device like an iPhone.

I don't think it's about IPhone or smartphones per see but the technology/software running on them which turns them into skinner boxes and which are not even constrained to certain physicals spaces as they are being carried and used everywhere. And the 9 hours on the phone is an absolutely worrying thing.