I think that is quite possible, Nan. (I'm sure their record company does market projections.) If so, theirs was not the most productive response, but pretty human, I'm afraid.
I am not sure there was any intent to specifically "dis" Reba McIntire (a brilliant singer, IMHO) or her fans. I think the reference to three very different artists in the CD changer may have just been a way to describe the broadest possible country fan. The speaker was just saying they didn't want to stay in the "box" necessary to appeal to that broad base of fans.