Apple has grown insanely profitable by building apps and services that run exclusively (with a few notable exceptions) on its own hardware. But as Google and Microsoft release a flurry of cross-platform services, Apple's hold on its customers weakens. Example: an iPad user who lives inside Google Apps, or one who uses Microsoft SkyDrive rather than iCloud, may be easily swayed by a non-Apple tablet when it's time to upgrade.
At last week's D11 Conference, Tim Cook hinted that Apple would be open to porting its apps to other platforms -- yes, including archenemy Android. "If it made sense to do it, we would do it. There's not a religious issue with it," Cook said during an audience Q&A session. This doesn't mean, of course, that Apple is planning to announce a spate of Android apps at WWDC. But Cook did crack open that cross-platform door -- if only a bit.