There's nothing a September call up is going to do in these games that will mean anything as far as next season.
I disagree, I think facing some entrenched major league pitchers/hitters will help young guys. You have to take your licks sometime. It won't guarantee anything, but that's not the point. Show them off to other teams, let them fight for a place on the team next season (hell, it won't take much to show up Tracy), figure out what the pecking order for injury replacements is, who cares. Make them do something, that's what they're there for.