I believe Ball Pythons are a great "gateway" snake. Great for converting people who have a fear of snakes due to ignorance (as I once had). I mean if you've never interacted with a snake you are much more likely to have a blind irrational fear of them.
Anyway my point is once people start learning about and keeping Ball Pythons and find out snakes are not "bad" as the media portrays them they are much more likely to explore the hobby and end up learning about and keeping other species as they become more experienced.
In conclusion I believe BP's help the hobby, but that's just my humble opinion.