As much as I <3 Apple, they're still a SPoF just like Lavabit or anyone else with centralized servers that aren't "SWAT-resistant." If iDevices could work without iCloud and usefully communicate with each other directly (sans cell network too), that would be impressive... storage, processing and wireless tech are all getting cheaper... p2p "iCloud" might be within the realm of not-quite-insane.

(Somehow, I feel iMessage and related apps are MITMable because there is no mandatory, mutual, out-of-band validation of a recipient's identity.)