Excellent post. I used to be for vouchers but not anymore. I've flip flopped on this issue since I was in grade school. I recall one of my 8th grade nuns discussing vouchers with the class. She also mentioned that two local (south philly) Catholic high schools would eventually merge or shut down completely (and this was in the late 70s). Those two high schools merged a few years ago. They were previously not co-ed. As for vouchers, she made a comment that any form of voucher system from the government would eventually lead to government involvement.
She believes that her mission is most certainly NOT to see that the children in diocesan schools are emphatically Catholic but rather that the schools under her conform to NEA/AFT norms methodologically and ideologically. The parents often fail to figure this out because they all too often uncritically trust Church schools. Exactly. ITA with everything you posted, too.