Why do schools still have drama class?

I wonder why schools still have drama class. I use to think the craft of acting had a certain je ne sais quoi to it. To be an actor you took classes, did community theater, then on to supporting roles on off Broadway features, then supporting roles on Broadway, then you earned the starting role. These days ANYONE can be an actor/actress it seem, a singer, sports figure, reality TV star, some mook off the street, pro wrestler (not that big of a stretch for them to make believe), even a war hero. Why take up drama when apparently it is a skill just about anyone can master not having taken one minute of class?