I second this: Pixelmator is great. But most heavy Photoshop users won't leave Photoshop unless dragged away. It's all they know. Sure they'll kick, scream, bitch. But suggest something like Pixelmator you get excuses like "But Pixelmator doesn't have [insert obscure filter that they've only used once in their life]".
You could not be more wrong with your assesment why Photoshop users stay with Photoshop.
I bought Pixelmator, and I also got CC licencse. I don't even remember when was the last time I had Pixelmator open.
Pixelmator is a great and cheap alternative if you indeed only need pretty basic things, but many need a lot more.
And if you are in print business there is no discussion at all.
In the end, they'll still stay on Adobe's CC.