You've certainly made a valid observation about business in general. Many businesses are still running XP or will run Win 7 for the next decade and are largely stuck on Windows whether they like it or not due to legacy software or Windows-only software solutions for their industry. On the other hand, the world of Education is changing extremely rapidly. Last year at the National Education Conference in Sydney I scanned the Wifi network to see what devices people were using. I was amazed. Out of the 650+ people on the network at the conference (mostly teachers) over 80% were using either iPads or Macbooks. During one of the keynotes about the future of DER funding and BYOD in schools the presenter asked for a show of hands from the audience regarding how many of them were using their own device and not the one they were issued by their school. The majority raised their hands. That means that when given a choice, most of the teachers in the room from public and private schools across the nation were choosing to use iPads or Macs.
I also have not seen a mass stampeded to buy macs especially in business, they are still not the biggest worldwide (no usa only stats, we are a big world) by a long shot. I dont suddenly see everyone I know with a mac, nor do I find a mass wanting to get one (excluding iDevices) and when people see the price it doesnt even get a starting foot when they can buy tablets/laptops for less. Business especially struggles to justify mac's unless they are very aware of a clear benefit.