One of the article's contentions is that the vast majority of users are satisfied with Windows and Microsoft programs as they are right now. Most of those programs are 32-bit.
By extension, if they are satisfied with 32-bit programs and don't feel a need to switch, then they won't miss 64-bit architectures.
Most people could care less about more applications...
Virtually all of the computer users that I know limit their use to an office application and a web browser on top of Windows. That's it. The web browser gives them everything they really need. I wonder how many computer owners could even tell you if they have 32-bit or 64-bit or how the two differ. Probably the same percentage that can tell you detailed specs about their car engines. Virtually none.
The only computer specs that matter anymore --exempting programmers-- are weight and battery life. A few hardcore gamers still care, but they're in the minority, even for video gamers. XBox anyone?
By extension, if they are satisfied with 32-bit programs and don't feel a need to switch, then they won't miss 64-bit architectures.