That just seems anti-competitory. I wouldn't expect Apple to reject google on the pretext of working with facebook, and I think it would be even more ridiculous for google to actually remove a currently existing app of a competitor.
The cloud music front is still up for grabs, something that should be Apple's to dominate, but so far it's not. Will Apple allow Google's cloud service on the iPhone? What if Google+ has some kind of cloud music functionality? Disallow both services?
Twitter, who just buddied up with Apple, obviously has zero interest in Google+'s very Twitter like stream and @ replies.
Microsoft is in bed with Facebook, and Microsoft has no interest in Android, let alone anything else to do with Google.
The Tech Wars are coming.