I think the iOS team is facing a tough (and interesting) problem. They need to keep the edge they have in terms of app quantity and specially quality, so introducing big changes that break or degrade how apps look or behave and require big changes by developers can jeopardize their advantage.
On the other hand change in unavoidable. They cannot stop in time. Each iOS version that gets released with minimal changes is another catch up that will need to take place in a later version. The more changes are delayed the bigger they get. Android and even Windows Phone are moving forward and so needs Apple.
I think that there can be a certain feeling inside Apple that is not exactly change aversion but maybe is something close. They got iPhone so right and had so much success with it that maybe there is some fear that introducing significant changes can mess things up...
On the other hand change in unavoidable. They cannot stop in time. Each iOS version that gets released with minimal changes is another catch up that will need to take place in a later version. The more changes are delayed the bigger they get. Android and even Windows Phone are moving forward and so needs Apple.
I think that there can be a certain feeling inside Apple that is not exactly change aversion but maybe is something close. They got iPhone so right and had so much success with it that maybe there is some fear that introducing significant changes can mess things up...