I definitely don't expect Windows or OS X to turn into Linux. I think they each have advantages for the people who are using them. The grandparent was talking about hackability, and I was saying I don't think OS X counts as hackable just because the kernel is open source. There is a lot more that's closed source surrounding that kernel that makes it OS X.
Perhaps people should stop expecting OSX to be Linux. In the same way that nobody expects Linux to be OSX.