Maybe someone more knowledgable on Apple history can correct me but aren't MacBooks being attractive to developers due to the Unix layer a happy accident? Apple never made a plan for that, and I don't think they really care more about that demographic more than before. I use Macs since nearly 30 years and I find it useful that I can now also develop on it, but I can totally envision switching for work, just like in the pre-Intel era. Apple always was about end-users, don't fight it.