I'm not sure why they don't just pull the app. They admit that it's bringing them virtually no users and it's a frustrating experience. With only a 1.3% market share (1), what reasons can there be to bother with it? (1) http://blog.nielsen.com/nielsenwire/?p=32494
As an example, if The Omni Group decided to go to Windows instead of NeXTStep, there's a possibility that they would never be successful as they are now.