It's remarkable how the platform has establised itself in just 6 or 7 years and I'm sure Apple wish for OS X to have the same legacy of applications that Windows and Linux enjoy.
Um, I think that most Linux supporters wish for Linux to have the same legacy of applications that Windows and OS X enjoy. I can't think of many apps that run on Linux that can't be re-compiled to run under X11 on OS X. But, I can point to tons of apps that won't run in any fashion under Linux.