What you seem to be overlooking is that those of us who do "real work" of the kind developers, designers, et al, do are now a vanishingly small percentage of the user base. Beige Windows boxes owned by the employer and running Office will remain in people's workplaces for the foreseeable future but people like me, a design/graphics professional working on my own machine are barely a rounding error in the numbers of people owning their own computers.
Yes, we pretty much kept Apple alive during the mid-to-late 90s, but we're largely irrelevant now. The vast majority of people who own their own computer want it for e-mail, Facebook, Twitter, YouTube. Add in light photo editing, a little WP and maybe some hobbyist video editing or music creation and you've met the needs of the vast majority, and you can meet those needs with a tablet.
Cheers
Jim