Make no mistake about it. With the announcement of the deprication of the Gmail App for BB's Google is decaling war on RIM and the users of Blackberries who want to make use of a GMAIL client (which works very well) on their Blackberries.
The reason is so simple. RIM competes with Android. So why make it easy for your users to work on the competition. Also, Google prefers web apps, not installed apps.