Each school is eventually going to have a down year and bad season. But when schools have a tradition of bad seasons over and over then yes the work hasn't been put in and most the time it's a result of bad coaching.
Please let's not debate Maury County Jr High Basketball. We all know those championships mean little in High School since the results don't carry over. One particular school has dominated girls Jr high basketball for years but there hasn't been any high school district championships and the same result over and over in the region with first round losses. I think one year a sub state appearance was made. After Jr High kids grow, some kids don't they may have the "man child" that had already peaked, kids stop playing, kids leave, new kids arrive, etc... Jr High Sports is good for the competitive nature for they age but again little results for the High School level.