Booting Windows on a Mac most likely wouldn't be enough to get people to switch. There's still the problem of whether or not you can
easily boot XP, or whether or not people are actually willing to go through 'advanced' steps (as I assume are in order) to do it. If Apple decides to implement this fix in some sort of way, then it's a possibility that there may be some growth in the Mac user population.
Personally, I don't see why MS doesn't make their software boot on Macs, and why Apple doesn't make their software boot on regular PCs. They both know that, no matter what, people are going to do it eventually. Mac OS X 10.4.4-or-whateverversionitwas was hacked within a few days by maxxus, though XP took a bit longer seeing that actual technology needed to be implemented instead of technology being disabled.
I'm waiting to be able to boot whatever x86-based OS I want, from 16-bit DOS to Vista x64 to OS X x86 to Linux x64, from the same machine. When this new hack gets published, then technically any x64-capable system would be able to do that, which is part of the reason why Apple most likely should switch back to 64-bit chips sooner or later, and implement some sort of UGA-to-VGA bridge while they're at it.
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