re: iOS 6: Apple Headed For Design Rut?
Point taken, Erc: Apple, grow or die. Folders, search screen, notification center are examples of how Apple has already changed its look and feel to accommodate useful enhancements. There would need to be more changes to insert a widgets bar create access to a directory tree for stored documents, etc. Eventually it may be time to start over. Apple has to be open to that.
But here's a pushback. Don't understimate the value of continuity. The current iOS design is pretty timeless and effective. It doesn't look stale. Change for change's sake serves no one, and lack of change in superficial look and feel does not equate to lack of innovation.
You cite OS X. Under the hood though Mountain Lion is a very different animal than Jaguar. Timeline, support for gestures on a touchpad, spaces, document versioning are just a few innovations that were big deals for users. Because the core of how things work has stayed the same, users can learn the new features very quickly.
Google gets the power of continuity too. How often do they change the basic all-white Google search screen? The original look and feel of Android wasn't a radical departure from iOS, which of course built on Palm OS, RIM, etc. Why? So users would know how to use the phone right out of the box and because some designs just make sense. There's a reason why most towel racks have been horizontal for centuries.
As another poster suggested, the rapid changes in Android's look and feel do not reflect innovation so much as the fact that Google released Android in a not quite finished state. (Brilliant decision, btw.) Now that it's a grown up, I'm guessing that the rate of change that users see will slow down while innovation continues under the hood and in infrastructure.
If that doesn't happen, then the combination of too rapid change and variability across vendors and devices will hurt Android in the enterprise, especially if Windows makes inroads and/or RIM rises from the grave.
Bottom line, it's a little more complex than one thinks.