I think it's possible that Apple will have an option in Lion to restrict installing non-App Store apps. It makes a huge amount of sense to have that there. I don't think they'll ever restrict it completely though; there are too many markets who need the ability to run whatever they want from wherever they want. But anyone who has had to fix the computers of family members would surely love the ability to restrict computers to run only apps downloaded from the App Store.
1/5/11 at 4:48pm