Back on topic:
I also had thought that after 8 years of HUGE success for Apple regarding iPhone, more OS X would have been adopted.
Mac is going "pretty strong" and "okay" etc. and has produced positive sales-figures where others have had it tough in the PC market.
But as Apple is only targeting the "mid to high-end" PC market, the focus is on a small market anyway.
As others have stated, especially in the enterprise, it's not about getting the best, but getting a necessary tool at the lowest price to get the job done: i.e. the best financial investment.
Apple's focus is on iOS. iPhone first, then iPad.
OS X is nice and will be kept alive and kicking, but it it will not get the focus that iOS gets.