The Trouble With 64-Bit
Fast forward to mid-2007, and 64-bit is still the other flavor of Windows. So what’s holding 64-bit back on the windows side? Drivers for one:
Microsoft is requiring those device manufacturers to develop 64-bit drivers if they want their devices to work with the 64-bit edition of Windows Vista, in an effort to ensure that device drivers are written to proper standards. But hardware vendors and application developers haven't wanted to take the time and effort to develop new software for an operating system that very few people use. As a result, 64-bit Windows software is hard to find, although Microsoft says the situation is improving.”
It is entirely possibly that Microsoft might follow a similar approach. Early reports on the next major Windows release, dubbed 7, indicate that it might continue to follow the 32-bit and 64-bit flavors. On the other hand, it's entirely possible that such rumors will prove unfounded or that Microsoft will rethink their current approach.
It might take a major push from Microsoft to move the entire industry over to the 64-bit. We'll keep our fingers crossed that it comes sooner rather than later.