Discussion on:

Getting started with iOS Views and View Controllers: Part 2

Even with tablets IOS will remain a niche market. Android will dominate the market in the next 18 months. They are outselling iPads and iPhones 6 to 1.

http://static2.businessinsider.com/image/50bd70c96bb3f73b0e000006-900/.jpg

and

http://www.businessinsider.com/mary-meekers-latest-incredibly-insightful-presentation-about-the-state-of-the-web-2012-5?op=1

Never mind having to have your apps approved just to publish them. And what of proprietary internal apps?