While I would phrase this a bit more conservatively, I agree with the core reasoning. I bought my MacBook Pro because it has among the best hardware combo one can get in a notebook (and that includes keyboard, screen, touchpad, and form factor), and because, under all the glitter, it's a UNIX box. If they ever stop being a good UNIX box, I'll be back to Linux in a heartbeat. I run it on desktop and serves, anyways.
And I'm fairly sure I'm not alone with this sentiment. At the conferences I go to, people started buying Macs when MacOS-X came out. Now there are about 80% Macs, 18% Linux (on everything from ThinkPads to cheap netbooks), and 2% Windows (and those only buy the people who work for Microsoft Research). Admittedly, this is not a large field, but academics are an influential group in general.