I like Windows 7, and I'll admit, I like OS X just as much. What MS has to worry about is that Apple markets well, much better than they do. However, in this economy a Windows 7 PC/Laptop is simply a more economical choice for the masses. A struggling middle class family in these times is not going to select a Mac and they will not lose any sleep selecting a Windows 7 platform.
Still Apple will succeed, just not in the desktop computing world like Microsoft has. OS X is here to stay and I don't think that is a bad thing. Linux, unfortunately, I am not so sure about. I like and use flavors of that too. While I find it usable, it does not appeal to the masses like OS X does; like Windows does.