Technically moving to Android doesn't mean RIM has to give up much exclusivity. (Almost) No one likes the RIM OS, they like the RIM messaging and e-mail apps (with the related back end services). There is nothing stopping RIM porting those to Android and still keeping them exclusive. This way if you want to use the blackberry apps you still have to buy a blackberry and RIM gets to use a much better OS with a much bigger app ecosystem and free up some OS developers. Looks like a bunch of upsides to me.