Yer my old school served all that (Don't think turkey twizzlers, but that kinda stuff) , then they said they we're going healthy, but all they did was get rid of it all and not replace it, was rubbish afterwards. They sold a couple of over priced sandwiches and an apple and that was about it. Funnily enough people stopped eating there :)
If they did a selection of fresh pasta dishes and curry's ect. it would work like my college does now (though its still too expensive) it works, people eat healthy but if you expect people to eat something that looks like its come out of the chefs rear and then look confused when people don't buy it.
It can't be that difficult to make simple food on a large scale surly? I'm quite sure its all down to the schools giving catering to outside companys, these are there just to make money, do everything centrally and ship it out so its not fresh, and only sell things that last a long time and kids will eat / buy, turkey twizzlers.