is it gets Apple into IT Shops that they normally wouldn't get into, because the new Macs can run Windows software and are virtually a PC. Many IT shops prohibit buying of Macintoshes, but if the new Mac is more like a PC, it might get accepted over the PowerMac.
It would also save Mac Users from having to buy RealPC or VirtualPC if the Mac ran Windows code natively. Even with OSX, it can get libraries added to run Linux X86 ELF binaries.