It's not slowly dying, it's already dead. Symbian was developed by Nokia, and recently Nokia decided to stop using it in all their future products and use Windows Phone 7 instead. So once the current Nokia phones that use Symbian are no longer on the market (and phones don't have a long shelf life), that will be the end of Symbian - no more new products using it, and developers are not going to be interested in a platform that has no future.
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