Yes, they do. Every week they have an established country artist on as a guest host, and they also do guest judges. Phil Vassar, who is a star in country music, is one of their regular judges. Leann Rhimes was the regular host last year and this year the hosts are Wynonna Judd and Cowboy Troy. But cable simply doesn't reach the same numbers of people that broadcast TV does.
As for Garth Brooks, I think he did retire. I don't follow country music closely, so I don't know why.
The other problem is - doesn't it run opposite AI's results show or something?