Regardless of how one feels about the current state of soccer in TN with the rules as they are now, the only question I have is about facilities and referees. As for facilities, if you put both in the fall, it would be a disaster. Football plus 2 soccer teams playing on 1 field. Never would happen. Plus many "less urban" schools have little league football and middle school football that use their high school field. Throw in that many places have 1 coach for both programs and you see how the logistics just simply will not work.
As for referees, we have a hard time getting enough referees now, if both boys and girls are in the same season, I feel it would be next to impossible to get games scheduled. Throw in a few weather issues and well.... you get the point. If they put Girls and Boys in the same season, would they extend the season to have more available game dates. Then you are either starting the season much earlier (freezing cold in the spring) or ending it after many schools have ended.
The only resolution in my opinion is to change the participation rule or just have players decide whether they want to play high school or play in these other leagues, etc.