I switched to Android almost two years ago, primarily for it's extensibility and flexibility. 1 year later I started tinkering with custom ROM's, kernels, etc. and I honestly don't see myself returning to an iPhone again.
It now seems Apple will follow suit with a more extensible/flexible (although restrictive) approach in iOS 8 - think "widgets", 3rd party keyboards, touchID API, etc.
I wonder if such shift moving forward could somehow stop a significant enough number of users from exploring the Android world in the first place, effectively slowing down the consistent growth-rate Android has enjoyed in the past couple of years.