Does Apple need to publish an 'End of Life' roadmap for iOS devices?

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http://www.zdnet.com – Today Apple releases iOS 4.3.3 to fix the ‘Locationgate’ bug. While this update is offered to a whole raft of devices, users running the iPhone 3G, released under three years ago, won’t be getting an update. Is it time for Apple to publish an ‘End of Life’ roadmap for iOS devices? (General)