I agree it should be easy. Just let the ones that want to play 7 on 7 club play. I went back and checked the tweet saying OHSAA was for the clubs and OHSFCA was against. The tweet was posted by an ohio HS coach.
I really don't think the participation in these clubs would be such that other sports would lose out on that many players.. KY, IN, and MI aren't overrun with these clubs. They really only exist in the larger cities. Most of the facilities that could host clubs are filled by indoor soccer, lacrosse, baseball, and softball. The expense and travel would deter others.
What I mainly feel is that parents and students should be free to make the choice. I prefer government and quasi-government organizations to stay out of that decision making process.