I understand what you're getting at, but I dont know the source of the quoted part of your post. The word master existed long before slaves were brought to America. So it didn't have it's roots in slavery.
That said, I stated I don't really know where we are in terms of whether the word should be discontinued. If it should be, then by all means let's get rid of it. I just think we should make sure that's the right call. That's all I'm saying.