Number one distro, maybe, but no Linux distro will ever be the number one OS.
It's not Mac, for those people.
It doesn't run Outlook or MS Office, for those people. OpenOffice is not MS Office, no matter how good it is. Anything run within wine is merely a niche within a niche.
And it doesn't run whatever is the current set of MS enterprise apps and frameworks, for those people.
Linux will be a widely used server OS and a niche desktop OS, for the foreseeable future. iPads and smart phones will obliterate the desktop market before we ever see The Year of the Linux Desktop.
