I think the problem on this is that a huge amount of "people who matter" usually choose what they are familiar with.
See Wikipedia example, for instance. I think the problem here is not Aunt Tillie but young Bob...
In my experience, I have seen some, let say, "enterprise" decisions about which distribution to use, only based in people's past experiences. And it is reasonable also, they are not looking for the best solution, they look for a solution that fit their needs.