Originally posted by onlooker
Ok, then I don't think it will be possible. It's better for Apple is if it isn't. Nobody will bother to port their apps to native Mac OS if you can run both. How will Apple get any new possible developers with this switch if they really don't need to port anything. I think Apple being on x86 makes them appear as a more attractive, and viable option now as a port, but if they can have their app running natively on a Mac under a different OS booted what's the point?
Why would someone buy a Mac at a premium price to run Windows? What you're saying, if I read it right, is that Mac users will just start buying Windows versions of apps (or Windows apps, if there is no Mac version) and running them in Windows on their Mac. Then, over time, these Mac users will eventually run all of their apps in Windows and wont even bother booting into OS X.
So Mac users would all use Windows if only Macs could boot into Windows? If so, then I'd suggest you have a very misinformed stereotype of Mac users. Mac users buy Macs because they don't want to use Windows. They pay a several hundred dollar premium to run OS X, and most of them prefer OS X over Windows enough that they do not run Windows in VPC unless absolutely necessary.
If developers start killing critical applications for OS X, people aren't going to buy Macs to boot into Windows, they're just going to buy Wintel boxes and save some dough. Maybe a few fanatics will pay extra for the style of the Mac boxes, but that will be a rare event.
Even for games, most people would rather not reboot the system into Windows. The hardcore gamers won't buy Macs anyways, so the Mac market is left with more casual gamers who tend to play games to take a break from doing other things. Who wants to close all open documents and shut down OS X to take a 30 minute Quake 4 break? Even Linux users scream for their own versions of popular games like Quake 3A. They could just boot into Windows, but they'd rather not, because it's a hassle, and because they're running Linux so they don't have to run Windows.
Mac users run OS X because they don't want to run Windows. They already have the option to buy a Wintel, but they don't. Making Windows an option on Macs doesn't change anything.
Furthermore, this post is moot, because Macs will never run Windows out of the box. Only bad-ass h4XXo4s will be able to run Windows on their Macs.