I don't really expect them to take it away completely. So, a simpler version is that I expect the capability to silently disable applications on user machines will be misused (through third-party insistence if nothing else; see the _1984_ debacle at Amazon). A similar system which could only throw up scary warnings when starting an unsigned application wouldn't bother me much, since it wouldn't be such attractive lawsuit bait. But I agree that I'm only speculating that Apple will carry this through to its natural end of being iOS-like. I can't imagine any reason for them not to do it, and I think that for the majority of their users, it will actually improve the experience.