Considering you can install Linux on Macs (dual booting, obviously) then your prediction would be 99%.
Not gonna happen. Even Windows don't have that...

Ubuntu is VERY simple to use. It even feels like what Windows should have been. If you were looking for a computer solely based on ease of use and reliability Ubuntu is probably the best. No contest. But unless you live on some sort of carefree planet where nobody plays games, uses commercial software, that's not gonna happen.

yeah, and most of the linux users are happy to pay for closed source games.

You know, while I agree that Ubuntu is easy to use, I'd also say that it's easy to use as long as it works; when something goes wrong God help you if you don't have an internet connection to go to the forums or some prior experience in Linux-land.

No, I was trying to use Ubuntu. It wouldn't install the wireless drivers, it wouldn't install a printer, it wouldn't do anything I tried to get it to do!

I'd say this is often true for Windows as well, with the added caveat that most users wouldn't even think to visit a forum, or have enough knowledge to troubleshoot the computer themselves.

Not really, most of the people get Windows preinstalled when buying a PC and it has all the drivers already on and the hardware works or they just pop in a CD from the vendor (printer manufacturer for example) and get it installed, and those who chose to install it themselves usually have the knowledge to make it work.
Now, install Ubuntu on a Dell laptop that hasn't got an Intel wi-fi chip and witness the pain; or try to get a Creative webcam to run on it, or a printer that's not suported. Pop in the driver CD you say? Nope, sorry.
Don't get me wrong, I love Linux and Ubuntu, it's just that it has a long way to go until it truly becomes desktop ready.

Business expansions are done absed on possible markets, not realized markets. Risk vs. reward.

I hope "Mac" means "Cross platform".
Steam / TF2 is basically the only thing stopping me from booting my Arch install.

My kick on Linux, only use it when needed. My old PC died a few weeks ago and the HDD has bad sectors, won't install NTFS filesystem anymore. It does work with Ext4 filesystem, so I decided to give Linux a go. Yes, I never had that problem before nor did I hear of it when getting my CompTIA A+. So, I got Ubuntu on my old PC andit does fine with a netgear wifi-adapter, but I remember how it doesn't work with WEP networks nor Linksys and Microsoft network adapters like I used to have.
Yes, Ubuntu it nice. But did you try running games? Only 2 I got to run from GOG is Fallout and Jagged Alliance2, and both run so slow sometimes it misses a mouse click. I am predominately spending my time on Win7 anymore after taking a day to get the Ubuntu PC running. Ubnutu is nice, the desktop is nice, the OS just doesn't run games and that is 75% of what I do with a PC. It doesn't even run OGame right via web browser, a browser game.
EDIT: Also isn't Steam late or are they taking the thunder from Gamersgate.com? GG has a Mac section.

And so do most other download services like Direct2Drive, Greenhouse, and more. Steam didn't need to worry about catering to both because it has such a gigantic share of the PC market. It's nice that they are coming to Mac now, though.

No, I'm not saying Ubuntu problems are easier to solve. Those with no knowledge beyond "click Firefox/Explorer/Safari to open the internet" will always have a hard time when the computer decides to fuck with them, no matter which system they use. It's simply so that most of that category of users currently use Windows (often because Windows is the most common overall, so they feel secure having a logo they recognise on the desktop), some use Mac OS and very few of them use Linux because there's a rumor about it that it's difficult to use also because Linux is pre-installed on very few computers so it currently requires an active choice that such users do not have the required knowledge to make.
I don't agree. Given the similar knowledge of each system, a user will have an equally hard/easy time solving the problems that occur. Of course, if the user knows Windows but not Ubuntu/Linux, he'll be able to fix the Windows problem easier, the reverse is also true.

Very true, I am beginning to get used to Ubuntu right now and the infamous SUDO commands. It's sorta like learning DOS commands the first time, you gotta type help a ton and still don't remember it no matter how hard you try, years down the road it feels like home. I'm not there yet I'm in the first part still for Linux.

It only works on modern graphics cards because of a fan patch. Steam didn't care to help anyone get it running on their modern computers, and when they released it they basically said "Screw you." to everyone who purchased it and couldn't get it to run because they mention somewhere that all games may not run on all systems. I don't know if they actually have packaged the patch with the game yet, but it used to be there was a link on the forums to an external site where you could get the patch.