So the way forward for Apple is to go back to the 1990s? Sales of desktops/laptops have dropped from 350 million in 2012 to 250 million in 2017—and most of those are Windows boxes.
Makes sense that most would be Windows boxes. Most Mac fans feel the 2012 Macs were the best computers ever made and Apple has been consistently getting worse ever since. The only people who seem to like the current direction of the Macs are iOS fans who love seeing the Mac get more iOS like even though they personally would never buy a Mac because they want an iPad.
It would be very interesting to see how Macs would sell if Apple would release one targeted at actual Mac users. Given the way MS is currently pissing off people by pushing software as a service with windows and office, it could work out very, very well for Apple to produce a computer for people who want a computer rather than they "what's a computer" bull.
PC sales are dropping because both companies are pushing hard in a way consumers and businesses simply do not want.
Edit: Also nice hyperbole going back to the 90's when you yourself say peak PC was 2012. Most Mac fans would jump at the chance to buy the 2012 chassis updated with a modern CPU/GPU/SSD/RAM/display. That would be a heck of a lot better than anything currently only the market from any company, Apple included.