I think you are mistaken on some points.
First, most people can barely get their head around a computer let alone dual boot systems. Even Apple OS 9 and OS X dual boot system where problematic to many users – especially the casual computers that Apple is trying to attract.
Second DVI, DVD, wireless and optical audio where standard on PCs before on Macs. It may not be built in on motherboard, but nevertheless ‘standard.’ There is a misconception that if it is not on a Dell, it must not be a standard on PC. In fact, like most inovative ideas – smaller companies like Alienware, Winbook, etc where loading up laptops far ahead of the bigger companies. You would be surprise to know that G5’s aluminum design was 2-3 years behind companies like Lian-Li.
Back to the topic – the problem with the Windows on Mac is that there is no tech support. The target audience for this *needs* tech support. This is why your typical Dell, HP, etc have at least 1 year – if not 3 years of tech support. Far longer than many Apple products.
If Windows support this officially *and* they support OS X in PC, then I think you will get casual PC users interested.
Apple have slowly addressed many of the complaints of the PC users wanting to transition (performance, 3D, etc), but there are still somethings left.
.02