I'm not a Mac fan by any means - I'll use it if I have to; I'm more comfortable with PC - but I work in both education and the creative industries and from what I've seen, the penetration of Mac desktop into those sectors is just nuts. I'm always amazed by the number and fanaticism of the Mac users I know, and in many cases, their wariness, derision and even outright fear of using Windows. Tell them they have to use Photoshop or Premiere on a PC, and a lot of them look at you with panic like you just asked them to land a 747. Keystrokes aside, most of the software they use works exactly the same on both platforms, but you cannot make them see that.
I wouldn't underestimate the stubbornness of users who are entrenched in a particular system, especially users who are not first-and-foremost computer tech enthusiasts (artists, teachers, photographers, editors, etc.), who have been intensely marketed to by one company for decades, "don't have time to learn a new system", and are the ones making demands to IT departments about what hardware to buy.
They might move eventually, but it won't be overnight, and I think a lot of them will be way more forgiving than you might expect.