Imagine if WalMart required vegetable growers to use WalMart brand fertilizer if they wanted their vegetables sold at WalMart. That seems a bit more like the current situation with Apple. It's not at all apparent that there was a quality issue with apps not programmed in Objective-C, and it's certainly not obvious to me (as an ex-Apple employee, Objective-C-coding, iPhone and iPad developer) that Apple would be able to prove in court that the license agreement is about quality rather than competitive interests.