I doubt it. Apple's stance is that _all_ developers must stay in line, not most. What they think would happen is that _some_ developers will supply their own store, cloud implementation and slightly different UI, separate update method, because they think they can improve upon Apple's offering (maybe rightly so), it is cheaper for them, easier to integrate, more inline with their ideals, or whatever. End result would be that users will go from "I know how to update my stuff/control who see my data/manage hi-score/etc" to "you have to be a nerd to do that" mode.

I think they are right; some developers wouuse noose to be different. For example, Adobe would try and use something AIR-based and there would probalby be more than one Linux package-manager-like thing that allows you to get a 'special-for-you compiled executable with exactly the features you want')