I hate this news! Sorry Sterling City! :*(
While this should happen more (IE: 11-man, to 6-man, back to 11-man,) I can't remember another example of it.
If you are a sixman school near an urban area, then you may not be a sixman school for long. Conversely, you will probably play sixman if you are a rural school district without oil.
The oil schools, like Sterling City, will have perodic population growth, which may force them to play sixman some years and 11-man during other years. I also think the 6-man schools on the bubble of urban areas (the 7 in Hill County come to mind, Milford, Prairie Lea, Buckholts, McDade, maybe Lometa or Evant) might experience something similar, especially if the urban areas (San Marcos, Waco, the edge of DFW, etc.) don't totally boom.