I work for a university that has very close ties with the airlines. I spoke with an employee who works in network planning/development.

Besides that, I thought it was pretty well known that CVG was in reasonably close proximity to IND,SDF,DAY,LEX. It's not surprising that these airports no longer have flights to CVG.

From what I understand CVG and IND are pretty vocal about competing for passengers. I have not personally seen it but I understand there is a billboard located between CVG and IND that says something along the line of "Fly out of Indianapolis and leave CVG behIND".