I say again this is my reasoning for not allowing opting down:playing up is a choice that a school can make
All of your above reasons of why that school is struggling and are that schools problems, not other schools problems and should not at any risk of any kind be shared with everyone because of that schools problem. This is not Burger King, you can't always have your way
This why coops are delayed to long, if this school just can not field a team, then start another sport or activity and those who want to play football can enroll in another school, or work hard to coop with someone. but opting down delays any actual solution and just prolongs the problem or shares it with everyone else. Not every school is going to be successful at everything, some will fail and always fail in and at certain things, so look for other things to be good at that fits your school